I have JXD s7100B with Android 2.3.4. After rooting it and killing cell apps (and all unnecessary apps) it's battery lasted about 4 hours and it was OK. I used Battery Calibration from Google Play to try and get some more and after that it started acting weird: It could not boot (it would loop the bott screen) unless it's on the charger. After it boots it would drain the battery in less than 20 minutes! When I try to charge it it would charge to full in 10-15 minutes but when I disconect the chatrger, it will again last <20min.
After a few days it started acting normaly (booting and battery life) but few days after that it started the same again:cannot boot unless on charger and lasts <20min. I tried recalibrating battery again with Battery Calibration, reflashing firmware with custom rom and with original rom from the manifacturer - nothing. It still acts the same.
Once, while using bitrider's custom rom (I still can't use URL's ), I booted it and got black screen with no icons nor drawer (i guess launcher crashed) but with only the notification bar (battery level notification, working clock) and touch screen not working. I left it like that to see how the battery will work and it lasted normaly! After that I experimented with two original firmwares from the manifacturer and it drained battery fast like before. If I start JXD in restore mode battery lasts long there too.
So my guess is that battery is OK but software somewhere in Android is reading baterry level of 100% as 100% but of 97-98% as 15% and it forces power off although battery has juice to power the tablet. Is there an app that can tell to Android how to see battery or could I do it by editing the firmware somehow. Enything to make it work like it did.
Do you have a custom recovery? If so, I think there is some way to delete the battery configuration files from recovery. You charge the device until it says it's full, delete the files via recovery and then boot normally again. Then the OS will regenerate the files.
This is the same thing Battery Calibration should do, but maybe it's doing it wrong or something.
It could also be that you have some app that is draining the battery. This would explain why the battery lasts longer when no apps launch. Install BetterBatteryStats from the market to see if some app you have insalled is causing wakelocks (these drain your battery a lot). It is a paid app, but if it fixes your battery life, it's well worth it. You should probably try this before the other thing with the recovery.
Thanks for quick answer
SifJar said:
Do you have a custom recovery? If so, I think there is some way to delete the battery configuration files from recovery. You charge the device until it says it's full, delete the files via recovery and then boot normally again. Then the OS will regenerate the files.
This is the same thing Battery Calibration should do, but maybe it's doing it wrong or something.
Click to expand...
Click to collapse
Did that and nothing changed . I charged it to full and used Root explorer to delete batterystats.bin in /data/system and OS made another one but it did nothing.
SifJar said:
It could also be that you have some app that is draining the battery. This would explain why the battery lasts longer when no apps launch. Install BetterBatteryStats from the market to see if some app you have insalled is causing wakelocks (these drain your battery a lot). It is a paid app, but if it fixes your battery life, it's well worth it. You should probably try this before the other thing with the recovery.
Click to expand...
Click to collapse
Done (on your advice): nothing on the lists last longer than 20 seconds (I've just turned it on and let it drain). Application doesn't explains why I can't start it without charging it, why, when I deplet it, I only need to charge it 10-20minutes to full and why it happens on three diferent firmwares (Theoreticaly, maybe the same firmware - one on english, one on chinese and one made from chinese, but that chinese (original) worked normaly before Battery Calibration).
Well, apologies for making you waste money on that app when it didn't help then
Have you tried reinstalling stock ROM after doing a wipe in recovery first and just starting all over again?
SifJar said:
Well, apologies for making you waste money on that app when it didn't help then
Click to expand...
Click to collapse
No problem, we are trying to fix something more valuable here .
SifJar said:
Have you tried reinstalling stock ROM after doing a wipe in recovery first and just starting all over again?
Click to expand...
Click to collapse
I've reinstalled stock ROM a few times but I didn't do wipes. I just did it one after another. I'll do a "wipe data/factory reset" from recovery mode and then install stock ROM. I'll post here what happened.
scivias.a said:
I've reinstalled stock ROM a few times but I didn't do wipes. I just did it one after another. I'll do a "wipe data/factory reset" from recovery mode and then install stock ROM. I'll post here what happened.
Click to expand...
Click to collapse
That might be the problem then, I believe installing new ROMs without doing a "wipe data/factory reset" can sometimes cause issues.
Same . I've done data wipe/factory reset from recovery mode (it has nice "are you sure" screen 7 "No"s + 1 Yes + 3 "No"s) and then installed stock chinese ROM but again battery starts draining 3-4% per minute. Is there a partition in Android that doesn't get wiped with factory reset?
The system partition does not get formatted when performing a wipe "data/factory reset". Can you check to see if you can format the system partition in recovery?
That's an interesting information. I'll see if I could format it somehow. Options that I have in recovery are:
-reboot system now
-apply update from sdcard
-wipe data/factory reset
-wipe cache partition
-wipe media partition and
-reboot into factory test
Has anyone ported clockworkmod recovery for your device? If so, that recovery has the option to format system. Has someone created an all in one wipe that included formatting system for your device?
Sent from my SPH-D710 using xda premium
Any super wipe script should work
It sounds to me like your battery is actually faulty. Try another battery, or put yours in the freezer for about 30 min, then charge.
Sent from my PC36100 using xda premium
Fixed it!!!!
User named Friend on the apad forum posted that he found somewhere how to fix this issue and I tried it and fixed it. Thank you all who tried to help me - it is nice to see normal, helpfull people on the net. Thank you very much. Here's how I did it with the image for an easier orientation: goo.gl/XpC5I (can't post urls yet but this works. It leads to apad forum where it all started). All the best.
Glad you were able to fix it and good luck with your tablet. Hope everything goes well.
Sent from my Galaxy Nexus using xda premium
Related
Can someone please help me with this issue? My viewsonic was not showing battery levels properly. I always says 100% and at times just powers off. I check battery setting, and later tried to wipe my battery stats. After that all hell broke lose. Trying doing a wipe and restore in ALL aspects but I cant get it to reboot from back up or previous operating system.
Urgent help required
colinjjenkins said:
My viewsonic was not showing battery levels properly. I always says 100% and at times just powers off.
Click to expand...
Click to collapse
There is no fix for this at present. But, see this thread for a script you can use to estimate your charge percentage using an alternate method.
Trying doing a wipe and restore in ALL aspects but I cant get it to reboot from back up or previous operating system.
Click to expand...
Click to collapse
Do you have ClockworkMod Recovery installed?
Something grong with cwm? my batt always reported very good until I wipe battery stats in cwm, bad idea, now always report 100%.
Don't use wipe stats from cwm, it does not fix anything and could be worse.
Calvinx1 said:
Something grong with cwm? my batt always reported very good until I wipe battery stats in cwm, bad idea, now always report 100%.
Click to expand...
Click to collapse
It's a HW issue--nothing to do with CWM or wiping battery stats.
rajeevvp said:
It's a HW issue--nothing to do with CWM or wiping battery stats.
Click to expand...
Click to collapse
Yeah, mine says 30% until it suddenly drops after a few hours. I just deal with it.
If I do a backup in recovery and try another rom, when I restore the backup does it also restore battery stats? I ask this because when I flash a new rom I use battery calibrator and wipe stats, but I hate doing this everytime. So, if I have a rom installed that has the battery calibrated and do a backup, then wipe stats for a new rom, and then restore my old rom does it still need to be calibrated?
This has been nagging me for awhile, so a big thanks to anyone that can shed some light on this situation.
I think it may backup yeah but not certain. It doesn't matter anyway u not really need to do this any more. (except, I suppose, in extreme battery drain circumstances)
Sent from my X10i using XDA App
Bugly Astard said:
If I do a backup in recovery and try another rom, when I restore the backup does it also restore battery stats? I ask this because when I flash a new rom I use battery calibrator and wipe stats, but I hate doing this everytime. So, if I have a rom installed that has the battery calibrated and do a backup, then wipe stats for a new rom, and then restore my old rom does it still need to be calibrated?
This has been nagging me for awhile, so a big thanks to anyone that can shed some light on this situation.
Click to expand...
Click to collapse
Battery stats simply records how the batter has been used over time (since the last full charge.)
it has nothing to do with "Battery Calibration"
so don't worry just use your phone it will maintain it's self
Pvy.
pvyParts said:
Battery stats simply records how the batter has been used over time (since the last full charge.)
it has nothing to do with "Battery Calibration"
so don't worry just use your phone it will maintain it's self
Pvy.
Click to expand...
Click to collapse
That's a load of BS.
Battery stats indicates the % to the ROM.
In order to calibrate de battery u need to let it charge to a 100% (preferrably with phone off) and powering on and entering recovery to delete the file. After that unplug and restart the phone. Battery should be calibrated
Read more about battery stats here: http://forum.xda-developers.com/showthread.php?t=1445698
Zero|Cool said:
That's a load of BS.
Battery stats indicates the % to the ROM.
In order to calibrate de battery u need to let it charge to a 100% (preferrably with phone off) and powering on and entering recovery to delete the file. After that unplug and restart the phone. Battery should be calibrated
Click to expand...
Click to collapse
Incorrect.
the Batterystats.bin has nothing to do with the level shown to you.
this is managed elsewhere
also once the phone reaches 100% it deletes the file it's self.
source
Dianne Hackborn (Google)
https://plus.google.com/u/0/105051985738280261832/posts/FV3LVtdVxPT
neway no more flame wars on this or i will get in trouble
Pvy.
Hey guys,
I've just instelled cm10 a few days ago,
and it's making me crazy, hope you can help!
Most of the time it works great. BUT when I
play some games or use Facebook, it just
Shuts-down the phone, and when I turn it on
it says it got 1-5% Battery left. (it's not true)
When I plug the charger, the battery level
get's back to where it was.
I've tried updating to CM10.1 and the problem
presists.
so,
1. What's cousing those shutdowns?
2. How can I fix the battery problem after the shutdown?
Thanks!
You installed it with a full wipe?
Sent from the Matrix
Doorman404 said:
Hey guys,
I've just instelled cm10 a few days ago,
and it's making me crazy, hope you can help!
Most of the time it works great. BUT when I
play some games or use Facebook, it just
Shuts-down the phone, and when I turn it on
it says it got 1-5% Battery left. (it's not true)
When I plug the charger, the battery level
get's back to where it was.
I've tried updating to CM10.1 and the problem
presists.
so,
1. What's cousing those shutdowns?
2. How can I fix the battery problem after the shutdown?
Thanks!
Click to expand...
Click to collapse
Have you checked to see if this also happens with non-CM roms?
The first thing you should be doing is counting out a hardware problem so install a non-CM rom like a Samsung stock or based rom.
Also do a clean install or your roms to avoid issues. (Wipe data/factory reset in recovery, ONLY USE IF YOU HAVE A CUSTOM KERNEL/RECOVERY FLASHED).
Donnie Sins said:
You installed it with a full wipe?
Sent from the Matrix
Click to expand...
Click to collapse
I came to cm10 from stock, so yes.
CC10.1 - was updated from the ABOUT
menu (OTA update), So I couldn't wipe,
I just did "Factory reset" from Settings
after the update.
TheATHEiST said:
Have you checked to see if this also happens with non-CM roms?
The first thing you should be doing is counting out a hardware problem so install a non-CM rom like a Samsung stock or based rom.
Also do a clean install or your roms to avoid issues. (Wipe data/factory reset in recovery, ONLY USE IF YOU HAVE A CUSTOM KERNEL/RECOVERY FLASHED).
Click to expand...
Click to collapse
There was no Problems at all on 2.3 stock,
So I don't believe it's an hardware issue.
factory reset from the OS is the same as
Full Wipe, right?
calibration might help. Hardly hardware issue.
a korean guy told me so, they are from the future you know; already got the JB and all.
sent, and now this app cra.........
HAHA I know
but What do you mean by Calibration ?
battery calibration, or kernel stweaks.
sent, and now this app cra.........
Battery calibration - yes.
Kernel stweaks - How can it help?
It seems like a problem with the cm10 rom,
Anyone here using the CM10 nightlies?
Can you tell me if yours is stable or
has such isues ?
I think it's the battery info picked up by the ROM. Wipe bat stats to force it start from scratch.
sent, and now this app cra.........
Double post- Sorry
gastonw said:
I think it's the battery info picked up by the ROM. Wipe bat stats to force it start from scratch.
sent, and now this app cra.........
Click to expand...
Click to collapse
Hey, I've tried battery cal. again - it didn't help.
The main issue though is the random shutdowns not the battery stat.
It mainly happens with the Facebook app, Is it a known bug in CM10 ?
Just an update: I've flashed 2 other Stock based roms and the problem is worse Now!
It shuts down like 10 times a day now, on every screen even on Lockscreen sometimes.
The phone was 100% good before I flashed cm10! Did i do something wrong ???
What do you think's wrong with it?
Help! Please?
Does the screen flicker issues on cm 10.1 effect the phone in long term..Wil it damage the screen ?
Hi,
My s2 has recently started to have very poor battery life. I am on stock JB firmware. I've never rooted this phone, and don't plan to until the phone is out of warranty, which is still about 6 months away.
The phone was pretty full of apps, so I decided to do a factory reset: settings> backup and reset> factory data reset> format USB storage ticked.
This fixed a problem that I was also having with my WiFi connection being slow, but it doesn't seem to have fixed the battery life problem. The phone does not last the day, even with very little use whereas before it could go at least 2 days before the battery went flat.
Is it possible that something has not been wiped during the process and is still causing a problem? Does the 'format USB storage' option wipe the internal SD card?
In the battery menu the biggest drain in 'android OS' with around 50%. This suggests to me there is still something wrong.
Any help would be greatly appreciated.
Thanks.
Maybe you need new battery..
Check the apps which gives regular wakelocks..
Download wakelock detector and see who is the culprit
doctor_droid said:
Check the apps which gives regular wakelocks..
Download wakelock detector and see who is the culprit
Click to expand...
Click to collapse
maybe you need to wipe dalvik cache and recalibrate battery maybe some times it's a bit a galaxy s2 bug
http://forum.xda-developers.com/showthread.php?p=18600161
Thanks for the replies,
I don't think its the battery that is the problem, as I would expect a more gradual failure than what I have experienced.
I'll try the wakelock detector, that sounds like a useful tool.
Battery cal and dalvik cache wipe may also help. Is there a way of wiping the dalvik cache without CWM recovery? As I said in the first post, I dont want to root the phone
I think stock android recovery has a option to wipe cache...
Stock android recovery does have a cache wipe option. Does this wipe the dalvik cache too?
kingkevbo said:
Stock android recovery does have a cache wipe option. Does this wipe the dalvik cache too?
Click to expand...
Click to collapse
I dont think so
I too am facing the same problem on my JB XLWS. Now i reverted on ICS
Sent from my GT-I9100 using xda app-developers app
Code SyGma said:
I too am facing the same problem on my JB XLWS. Now i reverted on ICS
Sent from my GT-I9100 using xda app-developers app
Click to expand...
Click to collapse
So u have good battery life on ics??
Thanks for all your replies on this matter guys. I finally sorted the problem. It was the USB charging port. It was dirty. I cleaned it out with some contact cleaner and battery life is all back to normal. Unfortunately my Wi-Fi problem is back, so I'm starting a new thread about that if any of you knowledgeable guys fancy helping me out!
Sent from my GT-I9100 using xda app-developers app
I have done searching and reading but I just want to double check before I break something. Is it safe to flash EMG4 over the new 4.3 update without loosing IMEI? they both use the new format of reading the efs folder right? so it should be OK? And if it all goes wrong I can restore EMG4 efs backup or go back to 4.3 to restore IMEI?
well, from what i've read, it looks that it is the good solution.
i might try it later (when back from work )
if someone can confirm before i'd be grateful too.
I wanna know as well
Just do it, both EFS are compatible. Just your internal card won't bi at same mounting point (now is in /0 folder).
Sent from my GT-I9300 using XDA Premium 4 mobile app
You got it right, no problem ahead :good:
i did this went from BTU 4.3 to BTU MG4 and got a boot loop, only way to get back is to clear user data and cache wipe etc in recovery mode before you flash MG4.
I thought so but it is best to check first instead of just doing stuff and then trying to fix it after. To be fair 4.3 isn't working out too bad for me now. I tried to get away with just clearing cache but it was horrible. I got 8hrs battery life with light use:silly: and LAGS all over the place. So I drained the battery and left it out for 40 min, then fully charged while off then switched on and factory reset. I got 20hrs light/moderate use with WIFI always on after that. I will see how it goes but second battery cycle is looking OK so far......
flashbackvictim said:
I thought so but it is best to check first instead of just doing stuff and then trying to fix it after. To be fair 4.3 isn't working out too bad for me now. I tried to get away with just clearing cache but it was horrible. I got 8hrs battery life with light use:silly: and LAGS all over the place. So I drained the battery and left it out for 40 min, then fully charged while off then switched on and factory reset. I got 20hrs light/moderate use with WIFI always on after that. I will see how it goes but second battery cycle is looking OK so far......
Click to expand...
Click to collapse
In your custom recovery wipe the cache again but this time try wiping the dalvik cache aswell.