Hello. I've had a U30GT2 tablet which I picked up while on a trip in China for a great price (~$100 converted). I installed a custom 4.4.2 ROM on it and it worked perfectly for the past year and a half with no issues at all and a great battery life (7200 mAh IIRC). Two days ago however, I noticed it had died which was strange considering it was at near full that morning. After charging it to 100% (which only took 20 minutes, extremely strange) I unplugged it and used it to watch a YouTube video. Before the 23 minute video was finished, I got a low battery warning.
Rom I've been using for over a year without problems: Link
What I have tried so far:
Installed a battery monitoring app. It shows apps like Clash of Clans using 0.1% of the total battery over a 90% drain.
Factory reset the tablet, deleting all user content + apps. Problem persists.
Reflashed the ROM after formatting everything. Problem remains.
Flashed different ROM, no dice.
At this point I'm almost certain that one of the two internal batteries has gone bad and I am planning on opening the device later today, but wanted to make this post as a last-ditch effort to see if it is some rare firmware/kernel error after all.
Image of battery drain over <10 minutes:
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Image of charging process:
17A @ 3.7V = ~63W. My charger is 2A @ 12V = 24W. This doesn't make sense.
Image of "real time" battery mAh drain:
40,000 mAh at 3.7v = 148W! This HAS to be an error since you CAN NOT dissipate nearly 150W without some serious active cooling.
Try checking for wakelocks using Wakelock Detector on the Play Store.
Sent from my SGH-M919 using Tapatalk
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I am having trouble, the charging LED never turns green for me. It was plugged in overnight. I installed an app called "Battery Monitor Widget" and left it plugged in. The highest it reaches is 3801mAh out of 3840mAh. It was at this state for 2 hours, saying 99% charged. The tech specs say this is a 4000mAh phone, is that rounded from the 3840 the app tells me? or is something terribly wrong with my battery? Anyone else experiencing this?
also, if anyone can recommend a battery monitor app, I would appreciate it. I downloaded the first one I came across that gave actual numbers instead of a bar.
it finally made it to 3840mAh and turned green. It has been plugged in since my first post. Can anyone verify that their phones battery capacity is 3840mAh?
Yes, mine is the same.
I use juice defender ultimate, set cpu and juice plotter.
Works great for me.
I just installed the free JuiceDefender app and it appears to need root to work:
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Thank you both. Ever since I left it plugged in for basically two days, it has been charging and turning green in what I consider a reasonable amount of time. I still think I have an underlying problem and expect to have a shortened batter life, but I also think I will upgrade to the next 7" from HTC before it causes frustration.
frh1: your added picture made me even more excited to own the flyer.
I think you're good. These batteries have to go through some charge cycles before the calibrated correctly. Some batteries will never see 100% after a few uses. Both of my Sammy 10.1's would say they were at 100 then as soon as you unplugged them they were down to 98. I thought there was something wrong with my view because it was taking a while to charge. My first view charged very quickly. I guess I didn't notice on the first one because i was playing with it so much, but after a few full drains and then charges it started charging faster. That's one of the things I like about the view, it charges fast.
My SGP5 battery has been wacky since day one. First few days I didn't think it would charge past 80%, but I found if you charged it overnight it would hit 100% (that's after an 8 hour charge to 80%).
Today it showed 100% all day. I booted it and now shows 30%. The settings battery status does not show actual time on the lower scale. Like I said I was at 100% all day, and the chart goes up to a 100% peak, but doesn't flatten or go down.... as if the battery clock stopped (not there is such a thing).
Can't do a battery pull... could rooting solve this issue? At least you can do a calibration with root. I just don't want to root if this will be fixed in an update. But I really don't like not really knowing how much battery is left.
I have a similar issue. It seems random- I use it all the time and literally 1/2 of the overnight charges I put it through it gets to either 80% or 100%. What I've noticed is that even when it says 80%, it still performed as if it was fully charged.
I rooted my device a few days after I got it and I honestly didn't notice the issue until after I rooted my device. So it may be different for you.
I'm not rooted. Have you tried something like: http://www.appbrain.com/app/battery-calibration/com.nema.batterycalibration or manual calibration deleting the battery stat file? I'll gladly root if it solves this problem.
savergn said:
I have a similar issue. It seems random- I use it all the time and literally 1/2 of the overnight charges I put it through it gets to either 80% or 100%. What I've noticed is that even when it says 80%, it still performed as if it was fully charged.
I rooted my device a few days after I got it and I honestly didn't notice the issue until after I rooted my device. So it may be different for you.
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Same here, mine has all the same problems and also the Horizontal calibration never settles
Sent from my SAMSUNG-SGH-I727 using xda premium
To show how squirrely battery charging is, I monitored with Battery Monitor Widget and looks like this, one charge overnight without unplugging:
(each grid line is 1 hour, little over 1 day shown, screen was NOT on during charging)
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I have the stock CM10 rom installed, and it usually does something like this that only lasts for a few days and goes back to normal. But this has lasted for almost a month now. As you can see in the pic, sometimes its says charging but doesn't "gain" energy, and when it does in drains extremely quickly. When it is asleep or turned off it still drains. I tried charging it with a different cord, then with my computer. Then I tried using a GS3 cord & adapter, it charged faster, but I couldn't tell how fast it drained since I wasn't using it.
Do I need to replace the battery? If I do, will it cost a lot, because if it does I'm just going to get a Note or DNA....
Try using a battery calibration app, people say to use it when you flash a new rom. Also, it might be an actual problem with the battery itself. Try getting a replacement battery if so. But then again, before you do that try going to stock and see if the problem is still present.
Sent from my YP-GI1 using Tapatalk 2
once it charges I'm going to see if that will help. and my son deleted my stock rom (long story), so I'm stuck on jb/ics.
Also its recommended after you calibrate to drain the battery to 0% and then recharge to 100% afterwards. And as far as the stock rom goes, you can restore using Odin and download mode
Sent from my YP-GI1 using Tapatalk 2
wow it worked, the battery lasted from 5:30 to 7:10, a new record since I ever brought the device
coolwiththecool2 said:
wow it worked, the battery lasted from 5:30 to 7:10, a new record since I ever brought the device
Click to expand...
Click to collapse
How much screen on time did you get?
Hi,
I'm off to a festival soon and usually I have to bring 2 standard fully charged batteries and a 4300mAh anker battery to get through because all the ROMs I use seem to drain my battery, idle or not.
I have rooted my S3 since the beginning, going through a ridiculous amount of custom ROMs but now I'm starting going back to stock would be a better option. I've been using an iPhone 5 recently and was absolutely amazed when I fully charged it at 100% and then 2 hours later it hadn't dropped a single percent, granted it was locked the whole time but if I did this with my current S3 then I would of lost probably around 10 percent.
Can anybody recommend me a good ROM and tell me how much battery they're left with when they go to sleep/wake up. Approximately I will lose probably about 35-40% during the night.
right now i'm using the latest version of android revolution on my i9300
Stay on sammy based roms if you want better battery life, and if you want, stay on stock for stability, just fully debloat it from all of samsung crapola and install for ex. boeffla kernel. Kernel is the main succesor for good battery life in my opinion.
Then try playing with the kernel in boeffla settings, if you stick to zzmoove governor you'll get max 1% drop overnight (that's 8-9h).
Also to mention, all apps are greenified except Facebook and Whatsapp, WiFi was on but sync, gps, bluetooth etc was off, aaand battery is 1.5y old.
P(r)oof:
When i wen't to sleep round 1AM it was on 71%, in 9AM it was on 70%.
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I had boeffle before but didn't alter the default governor, just changed it to zzmove/zzmove battery so going to charge phone to full and see what drops I have, thanks for the tip
Just charge phone couple of times from 5-100%(Don't unplug in between, let it sit continuously) and you are good to go . Earlier when i got my phone a week before battery was pathetic(SOT-2.5hrs) and after a week usage and battery calibration i am getting a SOT of 5 hrs around(I can't expect more)
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1)Wifi is on 24x7
2)Social Networking(Whatsapp+Hike+Instagram+Facebook)
3)Email push services( 2 Gmail accounts)
4)Browsing(Chrome)
5)6-9 calls (5mins each approx)
I am just loving it (No bugs so far except that SD card 1 which will surely get fixed in next OTA) with superb battery, design aesthetics and yeah main selling point DISPLAY
Hope it helped some lonely surfers who are still finding a way to not buy the phone. I will say don't waste time if you have an invite just grab it. In next month when One Plus will Open source it's kernel, things will be far better placed than now(Custom kernels and roms )
Great.
I am getting a SOT of 4 hours, and generally make it home with 10% left in the tank.
I charge my phone before going to bed till 100. Disconnect. Set the alarm. Goto sleep.
Wake up. Overnight drain is around 10%.
Leave for office at 8. My phone is always connected to wifi or 3G. Also both sims are active. Bluetooth always active.
No email sync. Also I have disabled most notifications except calls. The only thing syncing is Whatsapp. Location disabled.
Also disabled auto brightness.
With similar settings my moto g delivers 6 hours SOT.
So I believe OPX is just average. But still kinda expectsed.
There is a dedicated battery life discussion thread already here,
http://forum.xda-developers.com/oneplus-x/general/oneplus-x-battery-life-discussion-thread-t3238108
No need for multiple threads on the subject. :good:
Thread closed.
Darth
Forum Moderator