I have seen different ROM's Stock and Custom have NFC on or off by default. When NFC is on the battery drain is quite a bit more, even when the phone is off (screen not on). I was wondering from developers if NFC could be turned off when screen is not on? For security reasons this would make sense too. If it does turn NFC off while screen is off, then why would idle battery drain be so much more siginifant when NFC is on vs off...
I can leave my phone idle for hours and still have 100%-98% when I open at lunch...but if NFC is on that may be much higher drain.
Thanks for any light you can shed on this topic.
Tasker would probably work for automatically turning NFC on or off based on the criteria you set. Be warned though, the learning curve on that app can be rather steep.
Related
I have had my tablet off the charger now for 1 day 14 hours and I have 61% battery left. I have used it periodically to read the paper and check email over the course of the least two days.
My settings include auto brightness, screen sleep after 10 minutes and wifi always on. I let the tab go to sleep on its own.. I do not force it with the power button. I revive it with the volume control.
I am running for months now tnt 4.1.0
I am not sure why there are complaints about a true "standby" or sleep state as I can not expect any better always on battery life than this.
insight3fl said:
I have had my tablet off the charger now for 1 day 14 hours and I have 61% battery left. I have used it periodically to read the paper and check email over the course of the least two days.
My settings include auto brightness, screen sleep after 10 minutes and wifi always on. I let the tab go to sleep on its own.. I do not force it with the power button. I revive it with the volume control.
I am running for months now tnt 4.1.0
I am not sure why there are complaints about a true "standby" or sleep state as I can not expect any better always on battery life than this.
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There are two levels of sleep. Screen off but CPU on and wifi on will run about 3% per hour. If you run the stock rom and let it go into deep sleep it will halt the CPU and shut down wifi after 2 minuets or so, and in that state it should burn about 1% per hour. It wont do alarms or reminders or check emails when in deep sleep.
So you can go about 33 hours without deep sleep. Or pretty much one day of use with alarms/alerts/push email. Or 3 days and off and on use with deep sleep. I prefer the one without deep sleep. I just charge it every night. I agree though, in with case it seems fine to me.
There are so many threads on this issue... it'd be good for the mods to combine them or lock/link to one master? Much like the 96% issue... both need dev attention and less General threads!
I have raised a bug with CM7 on the idle power problem. Idle power usage is huge compared to other devices. Hopefully this can be fixed...
http://code.google.com/p/cyanogenmod/issues/detail?id=3714
galapogos01 said:
There are so many threads on this issue... it'd be good for the mods to combine them or lock/link to one master? Much like the 96% issue... both need dev attention and less General threads!
I have raised a bug with CM7 on the idle power problem. Idle power usage is huge compared to other devices. Hopefully this can be fixed...
http://code.google.com/p/cyanogenmod/issues/detail?id=3714
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Click to collapse
"Currentwidget shows >300ma power usage at idle" from your report... do you happen to have the OC pegged high in SetCPU? Because wifi on, bt off, idle/screen on should be in the low 200s (214mhz clock scale) and wifi on, bt off, idle/screen off should come in at 100-120.
This isn't a "dev" issue - it's a hardware design issue. The gtab isn't designed for long standby, no amount of dev attention will fix that. 100ma seems to be the floor (with wifi on.)
schettj said:
"Currentwidget shows >300ma power usage at idle" from your report... do you happen to have the OC pegged high in SetCPU? Because wifi on, bt off, idle/screen on should be in the low 200s (214mhz clock scale) and wifi on, bt off, idle/screen off should come in at 100-120.
This isn't a "dev" issue - it's a hardware design issue. The gtab isn't designed for long standby, no amount of dev attention will fix that. 100ma seems to be the floor (with wifi on.)
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I agree, I can go about 30 hours before I have to charge it again. I do let it sleep but keep the wifi active as it has issues otherwise. It is a hardware limitation on the device not a dev issue.
schettj said:
"Currentwidget shows >300ma power usage at idle" from your report... do you happen to have the OC pegged high in SetCPU? Because wifi on, bt off, idle/screen on should be in the low 200s (214mhz clock scale) and wifi on, bt off, idle/screen off should come in at 100-120.
This isn't a "dev" issue - it's a hardware design issue. The gtab isn't designed for long standby, no amount of dev attention will fix that. 100ma seems to be the floor (with wifi on.)
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Click to collapse
This was with wifi on, bt off, screen on auto brightness, cpu pegged to 214mhz with screen off, pershoot kernel.
I disagree that it's not a developer issue. Based on my experience with Android on the HD2, a lot of the battery usage issues eventually came down to kernel optimisation -- incorrect GPIOs causing devices/sensors to remain on when the kernel thought they were off, high bt idle drain, incorrect voltages against cpu speeds in the scaling tables, backlight driver loops, etc. I do not think this is related to the device itself.
I can get ~48 hours standby, but this thing should be measuring standby in weeks, not days. My HD2 can get >2 days standby, probably 4 or 5 in airplane mode. It draws 3ma!
Cheers,
Jason
galapogos01 said:
It draws 3ma!
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Right - that would be a firmware deep sleep, where the firmware halts the cpu, and powers down hardware.
Note that when cpu halt ends the control of the OS right there.
The gtab's "deep sleep" isn't a whole lot better than "screen off, cpu lowest speed." No amount of kernel work is going to fix that.
Running VEGAN Ginger Edition, I get a full 8 hour work days use at the cost of about 20% battery life, probably about 6 hours of that is idling, the other two are browsing the web / goofing off playing Meteors or something.
Dismissing things like sync and widget updates, etc., which option do you think ultimately saves more battery life? On the one hand you have wifi constantly locked on even if the phone is in deep sleep for hours. On the other hand, if you find that you use the phone quite a bit in spurts, wouldn't it seem that the wifi constantly turning on and connecting, then turning off during sleep, would actually use more power than just being constantly connected?
It might be a bad analogy but I liken it to when you turn a car off and then on as it uses more fuel compared to just letting it idle for a few minutes instead. Would this be the same with power consumption on our phone?
I've seen many articles that indicate Wi-Fi is much better on battery life then using 3g. So I've been running my like that for awhile. Not sure about the results though. Wi-Fi is now my second biggest battery drain, behind Display.
Mine is set to stay ON always. I get better battery life when using wifi.Some say the opposite, try both ways and see which works best for you.
Sent from my SAMSUNG-SGH-I777 using XDA App
I have the policy set to sleep when off. Even when I do use my phone regularly, I find that at times its going to help you save more battery life without having wifi constantly scanning for access points.
Red5 said:
I have the policy set to sleep when off. Even when I do use my phone regularly, I find that at times its going to help you save more battery life without having wifi constantly scanning for access points.
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Click to collapse
Just up the scan interval.
Standby drain of our wifi chip is VERY low, less than 1/10 that of the original GalaxyS series if power_profile.xml is correct - and it's FAR more power efficient to transfer data over wifi than cell radio on our phones for a variety of reasons.
I get about 7 hours of battery everyday through medium usage and my battery drains quite a lot when I am revising and listening to music. I have a 1900 battery instead of the stock 1650 and it does improve battery life but is there anything else I can do? I find it a bit stupid that my battery drains so much when I'm just listening to music!
I am running CM9.
Whats the signal strength like in your area? Aside from the screen (put screen brightness down), 3g seems to drain my battery most in weak signal areas, where the signal bars are continuously on 1 or 0. I put my 3g / data off and my phone can easily go hours before any drop in battery percentage, I got 4 days battery life with 3g off using it sparingly or wifi when i could to check my emails. Only other thing i did was calls and texts, but that was just as a test.
But i like to keep data on, and gps, all the time. I often get 4 hours screen time and approx 24 hours battery life with my 2000mAh Samsung battery.
Aside from that, last time i checked cm9 was a battery drain, may have moved on a bit.
the only real way you can save battery "during use" is with some restraint. Ie turn brightness down if screen is on, listen at lower volumes if it's playing music. The more voltage it's using the faster it drains. So less brightness or volume output = less power used.
7 hours is around the average use for battery life savy users around here. Even with the extended battery I'd say your right about on the money for battery use (based on what I assume you do and don't know at this stage). But there is certainly room for improvement .
Now before I go on, you probably won't notice any significant difference to battery life during use from these steps. My only hope is that in-between use it'll save more power, and squeeze out a bit more usage time for you.
First/easiest thing would be go to check if it's sleeping properly. Just don't use it for say an hour, then go to the battery monitor in settings. Check the screen on and awake times, they should be almost idenical. If there are several awake records in between screen on's, then you have a problem.
If you use sounds like unlock sounds etc, go turn them all off.. this was/pretty sure still is an issue in CM9 (causes audio_out1 to continuously wake up the phone from deep sleep and drains the battery like a mofo). Also getting rid of facebook (if it's installed) will help.. it loves waking the phone for no obvious reason.. even with every form of sync, background data, and mobile data in general turned off .
^^ you don't have to do that step but I'm pretty confident you'd have to anyway, so it's just easier to do it straight up. Then you can look for other problems.
Next, install "better battery stats". If you like to support developers, you can quickly buy it off the market. Otherwise it's free here if you search for the official thread.
Reboot your phone, then leave you phone for an hour or two, then check out whats happening in better battery stats. I'm not going to pretend I unerstand what half of the stuff it bangs on about is, but I digress. Select "since charged" and then check each different tabs of data (partial wakelocks, kernel wakelocks etc). You are really just looking for anything that stands out as a red bar basically. small amounts aren't a real worry/bound to happen. If it's bigger than say 1cm long, it's probably an issue. Then it's up to you to find out what the app/process is doing the damage . So either google or the better battery stats thread will be your friend at that stage. It was obvious what is was for me cause it said facebook but you might have a different experience.
Hope that helps. But the only way that's going to make a real dent would be trying to use it less.. lol.
Oh and if possible, turning on airplane mode would save a bit of battery in use. And of course the obvious ones like turn of wifi, gps, bluetooth, data, auto sync, soft key backlight and anything else you can turn off
Just do it what i say .. Download the full version of app. called juice defender from play store..install it and then see the magic by yourself ..i have been using the same ..it almost double up the battery backup through its advance settings.
Sent from my GT-I9100 using xda premium
Hey guys, so I just got the Z Ultra C6833 with 4.4.4 Kitkat, and battery is going down very fast, and gets me a little worried. I have the brightness set to the lowest, however I am not even using the phone, just simply keeping the screen on with doing nothing and battery is dropping from 100% to lets say 95% in about 1-2 minutes.
Something does not seem right, what do you guys think? Can someone please give me some input. Also no suggestions on rooting or anything like that if wouldn't mind.
This would cause me some bad issues because I cant have my battery drain that fast, just not acceptable.
Thanks.
you can check the battery logs in settings, see if you can find out what uses the battery.
Also, there are some programs you can download that can monitor your device ("CPU Monitor" is one) and tell you what is going on.
do you have location based services turned on, and does the phone get a GPS fix quick?
Download Greenify app and then Greenify all the apps that you don't require to run in the background unnecessarily. It greatly improves battery performance. In addition you can apply the Stamina Mode.
Hello,
Is anyone of you has tried this function and noticed a bigger consumption of the battery?
Thanks for feedback.
Regards
I use the feature and i still have great standby power usage. I'll attach screenshots of my battery usage and screen on time.
Yes, I also use the feature and have great time on battery.
But do you think this feature consume more battery than if you don't use it ?
I can't make me an opinion about that. One time I think it doesn't consume more and on the next charge I think it consume more.
Rather difficult for me to be sure about that...
Anyway, if it consume more it seems to be very light.
Well yes it definitely uses more battery than if you turn the feature off. The standby usage from the feature is quite minimal though. As you can see in the screenshot, my standby battery drain is almost non existent. I've used the feature on other devices with custom ROMs and the drain was far worse. Sony's implementation of the Double Tap to Wake is the best that I've seen, even better than the LG G2/3 and HTC M8.