This one is a weird one...
About a week ago, I needed GPS to navigate out of a town - I waited and waited and didn't get even any satellite reception... It turned out that I found the way by myself and just closed the navigation. A few days later, same situation, no visible satellites at all... Didn't have time to reboot the phone, so I just closed the navigation and went my way.
Now, something weird is going on with my phone... Usually I get about 2 days of battery life - but since last charging, it looks i will get about 4 days and I have been using quite a few apps, browsed the net, made SIP phone calls, made normal phone calls... (more than normal usage for me anyway).
Is it just me or are those two things connected in any way? Can it be that GPS has crashed somehow and in the result, lowered the power consumption of the phone? Is it possible to turn off the GPS 'on demand' to extend battery life?
All other stuff is working like a charm...
I am using stock ROM (4.1.2, radio: I9100BULS1, build: JZO54K.I9100XWLSD)
Why do not you try installing a different rom see why.
duykhanh187 said:
Why do not you try installing a different rom see why.
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Well, a colleague of mine has the same phone and has experimented with various ROMs - none gave him so much more battery life. It is not the question of which ROM is better in terms of battery life, but whether some weird (non-functional) state of GPS (I have it normally disabled almost all the time via drop-down menu) can cause the extended battery life. And if this is possible, can this be done on purpose?
The ROM stock give many problems, you're not in fact the only that the strikes. I advise you to try some Sammy Rom! JellySNAP v6 and, for example, a great ROM based-stock Sammy
-Marco said:
The ROM stock give many problems, you're not in fact the only that the strikes. I advise you to try some Sammy Rom! JellySNAP v6 and, for example, a great ROM based-stock Sammy
Click to expand...
Click to collapse
I am bumping this topic to continue the discussion...
I am aware of other ROMs and have experimented with a lot of them on another phone. Due to extensive set of installed applications, loads of data and relatively stable stock ROM, I haven't really taken the time to do the transition.
So, I am not really looking for a solution to fix GPS, but the opposite way. I want to know if I can break GPS on next boot in order to obtain such long battery life... How many days of inactivity do you get with non-stock ROMs? At the moment, I am getting 5 days of light use WITH stock ROM (WiFi, Bluetooth, data disabled, only connected to mobile network to accept and make calls). I was never been able to do more than 3-4 days and my battery is now over 2 years old....
So, please, don't try to persuade me to install other ROMs by stating that they are better and more stable - list your battery lifes in case of light use or inactivity.... Do you get 5 days on 2 year old battery?
If you think breaking GPS is somehow responsible for greater battery life, you're going to end up rather disappointed. That concept defies logic given GPS only uses battery when you're actually using it. How is it possible for battery life to somehow magically double as a result of GPS being 'broken' ?
Thus far you've not provided one duplicable 'test' that other people can try to see if they get similar results, and all you've done is blabbered nonsense in a couple of posts. I mean, do you honestly think people here are going to delete a bunch of GPS system files to see if they can get some magical extension in battery life ? I know I'm not, because trying to put that stuff back when your silly theory doesn't work is a pain in the arse.
Did it ever occur to you that given the battery is two years old it's quite probably on its last legs & is very likely chemically unstable (this is why 'old' batteries swell up & sometimes even burst). This instability might be causing the extra battery life as the battery approaches the point where it's no longer useful. Put it this way, that's far more likely than busted GPS causing the extra battery life.
So, please don't try to persuade us that breaking GPS somehow doubles your battery life with a 2 yr old battery. Logic & almost 3 yrs worth of different people's experiences on here with this phone just don't support your ridiculous assertions.
That was a spicy reply, MistahBungle
Some facts:
- No system update was installed in the last month
- No application has been removed
- System hasn't been rebooted for a month or so
- Never got more than 2-3 days out of battery in idle
- Battery is 2 years old and is physically not damaged or swelled
- GPS isn't working (not even receiving or predicting a satellite on a clear day)
- System is rooted for a year or so
- Battery lasts 4 days now (instead of <2days a month ago)
- Connected to 3G network (no data connection)
I would try to reboot my phone, but I am afraid that it will all be over...
So, to stay with firm facts - how much battery life do you get with alternative ROMs in real life? Is 4 days (5-6 days with new battery) something usual?
That concept defies logic given GPS only uses battery when you're actually using it.
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Can you then explain me the difference between Cold and Warm GPS start? As far as I know, phone tries to keep as accurate GPS time as possible and a bunch of ephemerisis data in order to decode GPS data faster, next time you enable GPS. This defies logic that GPS is completely OFF when it is 'disabled' by GPS button in Android system.
I mean, do you honestly think people here are going to delete a bunch of GPS system files to see if they can get some magical extension in battery life ?
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No, I don't expect it to. I am looking for information whether anyone experienced anything similar.
Did it ever occur to you that given the battery is two years old it's quite probably on its last legs & is very likely chemically unstable (this is why 'old' batteries swell up & sometimes even burst). This instability might be causing the extra battery life as the battery approaches the point where it's no longer useful.
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In Lithium-powered batteries, I haven't come across the fact that battery capacity is increased with battery ageing and sweling up... On the contrary, internal resistance goes haywire and capacity drops, contributing to even more heat being spent internally by the battery and speeding up the process of degradation...
I may have not been cooking my own ROMs and writing drivers for phones, but I have quite extensive background in embedded systems and electronics. Battery life can not increase just by itself - there must be a reason... My lifestyle hasn't changed, my environment also didn't change, other phones at home didn't experience such battery life extensions... The only thing that I noticed is that the GPS is not working. I opened this topic in order to discuss whether that's the true cause or not.
So, based on '3 yrs worth of different people's experiences on here', what could be the cause for such prolonged battery life? How can I debug it by myself without rebooting the phone?
Related
I want to flash to a newer ROM, but then i'll lose my battery-calibration. I will have a couple of days a real bad battery prestation and my battery will also not get better of it. Doens anyone know how to back-up the calibration and how to put the settings back after a flash?
Philotra said:
I want to flash to a newer ROM, but then i'll lose my battery-calibration. I will have a couple of days a real bad battery prestation and my battery will also not get better of it. Doens anyone know how to back-up the calibration and how to put the settings back after a flash?
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That is not possible since the ROM has to be trained to the battery. It is really very simple. All you have to do is run the battery dead on the new ROM and then let it recharge and it will be calibrated. There really is no calibration data so much as training the ROM to know your batteries empty state versus full state. The fastest way to run it down is turn GPS on as well as WIFI and BT and leave them on. Your battery should be dead in less then half the day.
Also please do not double post. We see your post and if no one answers then no one answers.
Solarenemy68 said:
That is not possible since the ROM has to be trained to the battery. It is really very simple. All you have to do is run the battery dead on the new ROM and then let it recharge and it will be calibrated. There really is no calibration data so much as training the ROM to know your batteries empty state versus full state. The fastest way to run it down is turn GPS on as well as WIFI and BT and leave them on. Your battery should be dead in less then half the day.
Also please do not double post. We see your post and if no one answers then no one answers.
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i agree on the first part but disagree on the rest
running the battery dead isnt good for Li-Ion batteries, and for running down the battery dead faster would actually put a lot of stress and heat (if youre connected to data and running very heavy apps that uses either wifi or data, or even A LOT of CPU) on the battery as well, heat is a no no for the battery, just let it down by leaving the backlight on and turning off auto standby, works for me and its going good
read some of this on the bottom, might help you
BigBadger said:
BATTERY SAVING TIPS
The first few days
• Immediately after flashing, you will probably observe very poor battery performance. This is due to the charging circuit having to reset itself.
• The battery meter will not settle down and give accurate readings for a few battery cycles. Give it a few days.
• For the first few battery charging cycles, try to charge to 100% with phone off and then allow battery to drain down quite a bit before recharging. This is so the meter will calculate drain well.
Recommendations
• Make sure you followed all of the flashing instructions to the letter. Especially the part about the hard reset.
• Backlight is set to high. You might want to change that.
• 3G is on by default. Recommendation is to turn it off when you are not surfing the internet.
• Don't drain your batery all the way down until it dies. Not good for these types of batteries.
• The GPS sucks the battery dry. If you want to keep track of yourself, consider something like GPSToday that only wakes up the GPS once in a while.
• Maybe you don't really need aGPS enabled. Disable and check GPS lock times and battery drain.
• Applications that run from the storage card consume more power so install oft-used or background-type applications to main memory.
Troubleshooting
• If your radio does not match your rilphone.dll you can get crazy bad battery drainage. Use the recommended radio or spend some time working out a good combination for your phone/carrier/location/usage.
• Check to see that some application is not still running in the background. Check, do not assume. USe the full Task Manager application.
• Check to see if the screen is still on when you expect it to be off. Soft reset can fix that issue.
• Some radios work better with some carriers and locations. Asking everyone to tell you what radio to use may not give you the best answer. Be specific about your situation.
If you have tried all the above and still can't get over a day with moderate use, you may actually have a bad battery. Try getting a new one that is made by another manufacturer.
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Click to collapse
I'm not sure that it helps (I do it anyway, lol), but I think it's a good idea to flash with the battery fully charged (and maybe plugged in, if you flash off a card).
But when the ROM is trained, it has to save tha calibration data somewhere in it's system? And when you can find dat data, flash a new rom and put that calibration data back, you do not have to train your phone anymiore, right?
If you flash your rom, You should be sure toloose preety much everything of your settings, as far as I know. And so on you wont be taking anything alng (as long as you havent a good backup-tool with you), ...just adjust the settings another time (If they are too many, tell me what you did, maybe I can help my own sttings ^^ (Hate the battaryusage aswell, ...)
Hi all,
Got my 920 a few days ago, and while it's a beautiful phone, I'm finding the battery life to be awful.
I've only installed a few apps on it, otherwise it's vanilla. With WiFi and GPS off and only moderate Internet usage (mostly Facebook and IM+) i get a max of 10 hours out of it.
My Galaxy Note easily does twice that with the same usage.
Is there anything I need to check/look for, are there apps that show what's chewing through my battery so much?
I love the phone but that sort of battery life means it can never replace my Note as my main phone.
Thanks!
I should add, it's running the Portico update. No crashes or random reboots that I've seen.
I have only had mine for a few days, but I have found with all WP8 devices (and I have tried most) a hard reset made a difference to battery life. Annoying, but true it seems, well, true for me. I have no idea if it is a placebo but might be worth trying if you can be bothered.
For your info, I am getting good battery life on my 920.
You need to discharge and recharge the battery a few times before the battery life gets better. In about a week you should find the battery life improves.
It was the same for WP7 too..... The software will calibrate the battery over time.
The Jones said:
I have only had mine for a few days, but I have found with all WP8 devices (and I have tried most) a hard reset made a difference to battery life. Annoying, but true it seems, well, true for me. I have no idea if it is a placebo but might be worth trying if you can be bothered.
For your info, I am getting good battery life on my 920.
Click to expand...
Click to collapse
I actually did a hard reset when I first got the phone home, out of habit really. I don't mind doing it again, but maybe I'll give the battery a few more days and see what happens.
Also check your background apps.
it'll get better
when I first got my lumia 920 the battery life was shorter than my old NL 900.. but after a week or so and after I did a deep cycle now the battery will easily last for 48 hours... in battery settings it usually shows 4-5 days :good:
battery life is hit or miss, some days you'll get wonderful battery life and others its horrible, I know that its hard to measure battery life because you just cant replicate the exact same usage everyday. I find it hard to believe that the galaxy s3 (basically the same hardware) has better battery life, battery is only 100 maH more.
I honestly believe its a operating system/ application issue, I believe that there are some applications that are cycling and wasting precious juice from the battery. better coded apps/ better OS control will really be a big deal in the next os upgrade.
emenny81 said:
battery life is hit or miss, some days you'll get wonderful battery life and others its horrible, I know that its hard to measure battery life because you just cant replicate the exact same usage everyday. I find it hard to believe that the galaxy s3 (basically the same hardware) has better battery life, battery is only 100 maH more.
I honestly believe its a operating system/ application issue, I believe that there are some applications that are cycling and wasting precious juice from the battery. better coded apps/ better OS control will really be a big deal in the next os upgrade.
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Click to collapse
I've found turning off background tasks which are not required makes a big difference on the battery. Each time I install a new app, I look at the background tasks and see that it doesn't get added. Only tasks I have running are weather and a news reader app.
Also, I will not allow location on apps that don't need to. Searching for location when an app opens also drains a battery somewhat.
That being said, with my use, I easily get 2+ days (48+ hrs) of battery life.
May be it have to be synced
In my opinion, one reason why this phone need the run in for the battery life is in the first few days it need to be synced with many clouds, facebook, facebook photo, nokia drive....etc. As this will make poor the battery life in the first run in. But after one week everything done, the battery life becomes better. Just guess.
I've also noticed that with bluetooth turned off I get substantial more life out of the battery(but I tend to forget to turn it on when getting in my car, then I dont get calls on my cars bluetooth). I agree with disabling push and do a manual poll on your email servers, I dont have facebook or any of that stuff on the phone. Im mainly on twitter and on my email.
from time to time I see the Location services running when I unlock the phone, I've disabled the location service on bing search but that still comes up from time to time. Like I mentioned before I think the OS has tons of pros and like any other OS in its "early stages"(I say this because windows mobile has been out for some time pre iOS and Android, but it will get better over time as the company realizes main stream OS are getting replaced as the go to home PC.
My experience with Nokia Phones is they need 1 or 2 weeks to get the full battery life....
The first 4-5 days they really have a horrible battery live.. But as I said it's getting better after 1-2 weeks...
BTW I'm really impressed with the battery life of my HTC 8S, I'm getting 2-3 days out of it with heavy usage...
My Lumia 920 achieves a little bit more than 1 day..
I've had the phone since it was released(when it really bad battery problems), I was going to go with the 8x but I really love the camera on the lumia 920.....
Ok for the past two days I've been using my phone with bluetooth off and i've been getting really good battery life, a friend of mine has a surface rt and he was having an issue with the battery depleting even when he left the device on sleep for hrs, he noticed that after disabling bluetooth the issue with the battery went away, this clearly points out an issue with the os and the handling of Bluetooth.
Surface RT and Lumia 920 have a totally different OS i don't think you can compare them that easy...
And it well known the Bluetooth deceases the battery life of every smartphone... It's the same with NFC (Tap&Send) and super sensitive touch or Wifi...
Just turn off the things you don't need...
My Samsung Note 10.1 tablet has no noticeable difference with Bluetooth on or off (that is, not actually using it, just having it enabled). It's using BT 4.0 which has very good power efficiency.
Any idea what revision of BT our Lumias have?
It also makes a difference if you switch your bluetooth on to be visible or not...
Ii is the same with Wifi you can activate to be notified when open networks are around... If you do so.. your wifi will use more power because it is constantly searching for new hotspots...
Well, it's been a few days & recharges, and it seems the battery is getting better.
Thanks for all the suggestions from everyone. I was severely disappointed with the initial battery life, and while it's getting better, I hope it keeps improving. Switching background data services such as push mail and chat makes sense when it comes to preserving battery of course, but so far from all the smartphones I've owned, this is the worst performing of all in terms of battery. I don't want to have to manually check mail or log in/out of chat, since that defeats the purpose of having a smartphone imho.
It's the only thing I have against the Lumia so far... even though WP8 is not as customisable as my Android phone, I certainly appreciate the design and how it works. I'll just keep crossing fingers for more battery conditioning
I think there is something like a help app from nokia on the phone...
You can disable the live tiles you don't use and the automatic xbox live sync service...
I wouldn't totally disable email sync... I just reduce the syncing interval...
If you have a lot of email accounts (maybe more) it even makes sense forwarding them all to a new email account and syncing all your emails
with this 1 account...
There are a lot of dirty little tricks to improve your battery life... Maybe every
single one don't make much difference... But all of them do...
With a lot of frustration, I have been experiencing high battery drain also, with the phone staying warm even while idle.
Following various comments, fixes, could be' on various forums, I hard reset my new, less than one week old, phone.
I was kind of annoyed, surprised it took a very long time to recover, with a picture of gears churning on the screen.
Finally it booted up with a message, reset or restore. Wasn't expecting the choice. I chose restore to see what's up.
There was an amazing amount of stuff to restore.
After restore completed, my phone was still having battery drain issues. I decided to check out what this back up and restore thing was.
Pardon me I never read the manual. No need to go into discussion of the process.
I then chose to disable back up and restore, soft reset, and boom. Battery usage is now at -2%/hr. instead of -12-20% idle.
Have any of you tried this?
First posted at: wpcentral
http://forums.wpcentral.com/nokia-lumia-920/201672-40.htm#post1888873
Hello fellow members.
My battery is almost 2y old. I think it's just gone bad already after this time.
5 days ago i changed my rom to newest ReVolt rom and kernel to newest Dorimanx.
Just before that (so i think it's not a case) i noticed significant baterry drain on screen on and off. Its about 1% every 3 min on screen on and about 20% slepp thru 8h in airplane mode (when i sleep)
But can i somehow chceck is my battery charging to the full capacity as new battery ?
If i'm not clear pls ask.
Without getting another battery to do a comparison or without dedicated battery testing gear, unlikely. However, I'd be getting a new one if one managed to last me two years without crapping itself well before that.
Edit - Having said, that, you can be fairly certain a two year old battery would either not be able to hold a charge/discharge as efficiently as a new(er) battery given batteries lose the ability to do these things the more you use them/the more you charge & discharge them
Buy a new one.
MistahBungle said:
Without getting another battery to do a comparison or without dedicated battery testing gear, unlikely. However, I'd be getting a new one if one managed to last me two years without crapping itself well before that.
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End of october im getting a S4 so wanted get thru somehow
But cant you check the real capacity with some app ? and whats the capacity of new original sammsung battery ?
Yep I hear you on the holding out for a new phone thing; I was going to wait until about then but my S2 started playing up hardware-wise & pretty much made the decision to go earlier for me.
From memory, a newish standard SGS2 battery holds around 4200mV full & about 3500mV close to empty (and I'm going way back in my memory here as I used a 2000mAh battery for all but the first two months), but that can be a little bit variable. I think given the age of the one you have, if it's significantly under that @ 100%, it's probably safe to say it's on its last legs (which is likely anyway purely because of how long you've had it).
Does your Nook go crazy when the battery gets around 15 percent? Mine will start opening and closing applications and then it will shuts down. You would think it would warn me ahead of time
I ran into this phenom several times, some with battery-level readings at even higher values in the 25-30% range.
I think part of the problem is the battery-level readings in many CM builds are not reliable: I've seen battery readings jumping as much as +/- 10 points immediately following an update to a different build -- hence there is a good chance the real battery level might not be where the reading says it is.
I thought that the accuracy on my build may be off. Guess the best think to do is put her on the charger at 20 percent
pepi4 said:
I thought that the accuracy on my build may be off. Guess the best think to do is put her on the charger at 20 percent
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digixmax said:
I ran into this phenom several times, some with battery-level readings at even higher values in the 25-30% range.
I think part of the problem is the battery-level readings in many CM builds are not reliable: I've seen battery readings jumping as much as +/- 10 points immediately following an update to a different build -- hence there is a good chance the real battery level might not be where the reading says it is.
Click to expand...
Click to collapse
I don't think it's related to CyanogenMod. I recall getting this wonky battery behavior even on the original B&N operating system. I don't have the problem any more, but I've done so many tweaks to my Nook that I couldn't tell you definitively what did the trick. Mine will happily tick down to about 3% or so, then shut off calmly. You can try flashing one of the kernels that Demitrius has posted in the dev forum; that may help. I'm running his Nook on Fire/Showtime kernel with great success.
Of course, I do need to say that one of my tweaks was ripping out the old battery and replacing it (which happened about the same time last summer as flashing Nook on Fire, hence not being sure which fix did the trick). There are guides on YouTube to replace the battery, and you should be able to find a new battery for $30~$35 US. It's not technically challenging, but it is difficult -- everything inside that tablet is gummed up with adhesive, and you need to take great care to make sure you don't damage the case or the screen while you're pulling the old battery out.
spcagigas said:
I don't think it's related to CyanogenMod. I recall getting this wonky battery behavior even on the original B&N operating system. I don't have the problem any more, but I've done so many tweaks to my Nook that I couldn't tell you definitively what did the trick. Mine will happily tick down to about 3% or so, then shut off calmly. You can try flashing one of the kernels that Demitrius has posted in the dev forum; that may help. I'm running his Nook on Fire/Showtime kernel with great success.
Of course, I do need to say that one of my tweaks was ripping out the old battery and replacing it (which happened about the same time last summer as flashing Nook on Fire, hence not being sure which fix did the trick). There are guides on YouTube to replace the battery, and you should be able to find a new battery for $30~$35 US. It's not technically challenging, but it is difficult -- everything inside that tablet is gummed up with adhesive, and you need to take great care to make sure you don't damage the case or the screen while you're pulling the old battery out.
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Click to collapse
I may just try the Fire/Showtime kernel. I'm not sure if I'm happy with 10.3.1. I've been having WIFI problems also since I've went to it.
Thanks
spcagigas said:
digixmax said:
I ran into this phenom several times, some with battery-level readings at even higher values in the 25-30% range.
I think part of the problem is the battery-level readings in many CM builds are not reliable: I've seen battery readings jumping as much as +/- 10 points immediately following an update to a different build -- hence there is a good chance the real battery level might not be where the reading says it is.
Click to expand...
Click to collapse
I don't think it's related to CyanogenMod. I recall getting this wonky battery behavior even on the original B&N operating system.
...
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Click to collapse
I agree that the problem of "NT going bonky at low battery" is independent of ROM version.
But false readings of "battery remaining capacity %" in some CM builds make the problem seem to occur at a higher battery level than actual.
Mine also started going crazy about a year ago when the battery got to around 17% left, this was on the original (rooted) B&N firmware, then about a month ago it would start going nuts when the battery was just below 90% full (still on B&N firmware).
I found that if the brightness was high or the CPU load was high then this made it worse, I used to use it a s portable wireless video player quite a bit and discovered I had to put the brightness to 50% or lower to try and stop it going nuts. Now it's so bad I leave it plugged into a power source all the time to use it, which has effectively killed its portability.
I have put CM 10.2.0 on it recently but that hasn't made the battery/touchscreen problem better or worse, except it can no longer read TF cards
Where did you get a replacement battery? That might solve the problem for me also.
Kevin Flynn said:
Mine also started going crazy about a year ago when the battery got to around 17% left, this was on the original (rooted) B&N firmware, then about a month ago it would start going nuts when the battery was just below 90% full (still on B&N firmware).
I found that if the brightness was high or the CPU load was high then this made it worse, I used to use it a s portable wireless video player quite a bit and discovered I had to put the brightness to 50% or lower to try and stop it going nuts. Now it's so bad I leave it plugged into a power source all the time to use it, which has effectively killed its portability.
I have put CM 10.2.0 on it recently but that hasn't made the battery/touchscreen problem better or worse, except it can no longer read TF cards
Where did you get a replacement battery? That might solve the problem for me also.
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It would seem that I also have this problem. I have rooted via the method at http://forum.xda-developers.com/showthread.php?t=1439630 I haven't installed many apps so I don't think that is the problem. I only rooted it last week, spring pad went down and Evernote only supports Nook HD for some odd reason from the B&N App store. I installed Evernote, Firefox, Tor, and the Tor browser from Google play/market. It only started doing this last night, at first I thought perhaps it was a virus or something. Then I realized it happened when the power got around 23%.
It just started doing this last night. The only other thing I did was update the NTHiddenSettings app via Google Play. Thinking that was it, I reinstalled the previous version but nope no difference. Other than what I have listed this NT is stock.
I did find a great battery removal video (and place to get them) at https://www.youtube.com/watch?v=3F0glSyvj2s I hope that is not the case as I really don't want to buy/replace the battery. But if need be...ok. I really like this tablet and it does all I need.
If anyone has fixed this (besides a battery replacement) please do post. Thanks.
Oh I just found on another forum someone posting about battery calibration https://market.android.com/details?id=com.nema.batterycalibration&feature=search_result which sounds like it may be our problem. Something messed up the calibration would certainly make our NT's go crazy. Anyone ever try this?
UPDATE:
After digging around I found that the battery calibration app in question doesn't do much other than delete a file that is deleted anyway as soon as you plug in your tablet and charge it. So that is not it.
And on another note with the "spare parts" app the 'battery history' option errors with "the application spare parts ) process.com.andriod.spare_parts_ has topped unexpectedly, please try again." Is this normal? It is version 2.3.7. NT Hidden Settings app application settings/battery use works fine and shows the amount of everything that has used the battery since it was last plugged in/charged. Could this error be a sign of the problem with the phantom touches and inaccurate battery display? And if it is a sign of something broken, what and how do I fix it?
This problem recently got a lot worse on my (nearly 3-year old) NT -- random opening/switching of app screens now occur at battery readings in the 65-85% range (used to be ~25%).
I contemplated replacing its battery, but with the cost of the replacement battery ranging from $22 (on eBay) to $40 (from New Power 99) and the risk of messing things up during the replacement process, I opted to simply trade in the NT for $30 of credit (trade-in offer valid till 01/17/15, see http://www.barnesandnoble.com/u/tra...FILIATES-_-Linkshare-_-TnL5HPStwNw-_-10:1&r=1) toward a new Samsung Tab 4 Nook on-sale (in-store, ending today 12/21) for $129.
FWIW, when restoring the NT to stock ROM (for the purpose of the trade-in inspection at the store), I noticed that the battery reading in stock ROM is ~20 points below the reading shortly before while running CM.
I have been trying out various 4.4.x ROMs (CM, Resurrection Remix, SlimROM) and had varying levels of success but the one issue that I have had consistently with all of them on my SGS2 is battery. 4.4.x seems to devour my battery no matter which ROM I am using (and the different ROMS are using different kernels usual). CM11 has far and away been the most stable so I have stayed with that but it too as failed to resolve my battery issue. I have never had much luck with battery life before but half a day is ridiculous. I thought about trying a different kernel but not sure that would help as #1 I would think the CM team would know better than I what would be the optimal kernel and #2 I have been trying different kernels anyway when I have been trying different ROMS as I believe the different ROMS have all had different kernels. Has anyone else had this issue? More importantly has anyone had any luck resolving this?
I suggest you to replace your battery. Beaware from cheap ones!!! I have I9100 too, i also try many methods to increase my battery life but i reach maximum 10 hours. Then i buy new batteries. It is not original galaxy s2 batteries but i think better than the original one.(1800mAh buy from ebay) Now i use RR kit kat rom with stock kernel my mobile data is always on and I go to bed at %35 percent of batteries.
1. If your battery is quite old, replace it.
2. Check whether you are having any wakelocks. Does it go to deep sleep?
3. When you say battery life as half a day, what is your actual usage? Screen on time, Wi-Fi, 3g, calls etc?
4. Betterbatterystats and greenify are your friends.
ottoasd said:
I suggest you to replace your battery. Beaware from cheap ones!!! I have I9100 too, i also try many methods to increase my battery life but i reach maximum 10 hours. Then i buy new batteries. It is not original galaxy s2 batteries but i think better than the original one.(1800mAh buy from ebay) Now i use RR kit kat rom with stock kernel my mobile data is always on and I go to bed at %35 percent of batteries.
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Thanks. My battery is about 2.5 years old, its an Anker battery, 1900mAh that I bought on amazon (I honestly don't know what constitutes "old" for batteries, is 2 1/2 years old?). As for ROMS I was actually running an older version of RR but had serious stability issues (related to sdcard, never was able to resolve it) and battery wasn't great (better than now though) when I upgraded to the newest RR I had some lingering stability issues and battery issues too so just settled on CM11 this time.
banjara said:
1. If your battery is quite old, replace it.
Sorry, but what in your all's opinion makes for an "old" battery? 2, 3 years? or are we talking 4+ is there a way I could test my battery to see if it going bad perhaps?
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2. Check whether you are having any wakelocks. Does it go to deep sleep?
I am not totally clear on wakelocks and deep sleep, I have "Battery Stats" installed (guess its not the same as the betterbatteryapp but seems to give some similar info) but its not clear to me how to read it all. In this case it sayd the stat period is 3 hours 8 minutes and out of that it has been in deep sleep 1h 51m and running time 1h 17m and wifi time 1h 25m and my batter is down to 74%, I am assuming that is not normal? In terms of applications the hogs are defintely the two audio apps poweramp and dogcatcher (they are just at the top of the list, the numbers it gives don't really make sense to me)
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3. When you say battery life as half a day, what is your actual usage? Screen on time, Wi-Fi, 3g, calls etc?
Well I have a 3 hour idea of my usage above, I don't use 3 g, I have wifi on about a third of the day perhaps, and actualy screen time probably just an hour or two, I do use it quite a bit for podcasts and music though. But I had tried it with my audio apps uninstalled for a few days and it still drained fairly quickly.
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4. Betterbatterystats and greenify are your friends.
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Will take a look, I kind of liked the battery stats option to compare to stats that others have uploaded, but I haven't checked out greenify.
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Thanks!
If your battery is 2.5 yrs old, that's almost certainly the cause of your issues. Good advice to stick to original Samsung batteries; though there's nothing wrong with the 2000mAh genuine Samsung battery Vs the 1650mAh one - I used one of these for almost two years.
MistahBungle said:
If your battery is 2.5 yrs old, that's almost certainly the cause of your issues. Good advice to stick to original Samsung batteries; though there's nothing wrong with the 2000mAh genuine Samsung battery Vs the 1650mAh one - I used one of these for almost two years.
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Doh, was hoping I wouldn't have to replace the battery. Actually... that said. Should a 2.5 year old mostly unused 1650mah samsung battery still be good? I think I still have the factory battery around somewhere now that I think about it. When I purchased the Anker battery I seemed to remember it was mainly for price and reputation reasons, not that the Samsung battery had such a bad reputation but the Anker had such a good reputation and a pretty good price.
I will give another battery a try if you say 2.5 years is old, but I do have to admit that the battery drain was not nearly as much of an issue with the older ROM I was using (RR 4.2.x) before, it wasn't stellar but not like this so it seems to me its more than just the batter thats giving me problems here.
Anyway, my phone is still golden other than the battery issues so if i can squeeze another year and a half out of it I'd be a happy camper. Any other thoughts would be welcome (and appreciated!)
Batteries discharge over time if they're stored/not used, ideally you should charge it up to/keep it at around 60-65% every few mths if you're going to store it for that long. If you've not touched it at all in that time, it might not be able to take/hold a charge anymore because that wasn't done.
Only way you're going to find out is if you charge it & use it.
Yeah, if you ended up getting 4 yrs out of a smartphone you'd be rather happy indeed.
If you really want to satisfy yourself as to whether it is indeed the age of the battery you're currently using causing your problems, do a clean install of stock & test that for a week. If it does the same thing with stock, you'll know for definite it is the battery. I'd be very surprised if it isn't though; they're not designed to last much longer than what you've had yours if you're charging/discharging constantly.
MistahBungle said:
Batteries discharge over time if they're stored/not used, ideally you should charge it up to/keep it at around 60-65% every few mths if you're going to store it for that long. If you've not touched it at all in that time, it might not be able to take/hold a charge anymore because that wasn't done.
Only way you're going to find out is if you charge it & use it.
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doh, yeah haven't touched it; and the life lessons continue (didn't know that about batteries). will try it out, if its gone its gone, lesson learned.
Yeah, if you ended up getting 4 yrs out of a smartphone you'd be rather happy indeed.
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Yeah, I suppose I am pretty easy to please, I don't do games and don't really do video and don't feel that my phone is particularly slow (yet) so so far happy enough
If you really want to satisfy yourself as to whether it is indeed the age of the battery you're currently using causing your problems, do a clean install of stock & test that for a week. If it does the same thing with stock, you'll know for definite it is the battery. I'd be very surprised if it isn't though; they're not designed to last much longer than what you've had yours if you're charging/discharging constantly.
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Thats a good idea, given what you've said i don't doubt that a large part of my problem is the battery (like I said before, with the older rom it was better but not stellar) do you know where I can find a stock rom nowadays? (sorry on the ROMS page they all seem to be custom roms, or perhaps i missed something?)
Thanks!
Stock roms @ Samfirmware, get one for your carrier/country (not 4.0.4 though, anything else is fine), if there's only 4.0.4 for your carrier/country, any other stock rom will do really -I just tell people to stick to carrier/country in the first instance as these have modems bundled with them that should have been tested by the carrier to give most people on their network good connectivity most of the time.
Or, Wanam has a thread in one of the development sections (I forget which; do a search or have a rummage around) that has CWM flashable stock roms if you'd prefer to do it that way; haven't had a look at the thread for a while so not sure if links are still live, but Wanam is a very active dev & I'd be surprised if he doesn't still have them hosted somewhere.
Does it drain more at a locationw where you use a certain Wifi?
I'm asking cause wlan-rx drains are know Android phones in big open Wifis as the phones get bombarded with signals from other computers/phones and are not filtered and keeps the phone awake.
Easiest way to find out is using Betterbatterystats.