Develop Bugs

[Q] Instant discharge.

So, I'm on my Evo today, playing a game (Air Strike). My battery is at 93% when I picked the phone up to play, and the phone is plugged in. Suddenly, with no warning what-so-ever, my phone shuts off. Of course a mini-freak out and many "wtf's" ensue. No warning, no signs, even the led went off. I pulled the battery, put it back, then plugged the phone in again. After that it gave me the blinking light indicating the battery was too low to turn on. After a few minutes charging she came back on and battery was at 5%.
How the hell does a battery go from 93% to 0% in less than 5 minutes, and give no warning at all?? Anybody else ever have this problem?

Wow I've have never heard or that happening before. Maybe a glitch in the battery stash? Did it take awhile to charge up to 100%? Can you reproduce the issue again?
Sent from my EVO (CM 6.1.1) using XDA App

I had this problem with my older phone once. The battery itself may have a problem or your phone is not getting charged properly.
Try These :
1) Try charging the phone overnite from the Wall charger (Not through USB of your computer)
2) If the above does not work, and you have access to another evo battery, then try using that.(try using a friends battery and charger for a day. ) (Ofcourse needless to say the charger and battery must be for Evoonly )
In my case, my phone started working fine again after getting my battery & charger replaced.

Probably shouldn't worry about it too much just yet. Could be something as simple as your battery meter was mis-calibrated. The meter itself is software so it can easily be wrong/off. If it continues you may have a bad battery.

Sounds to me like something is wrong. Did you just get the phone or have you had it?

Idk... The phone had been plugged in for most of the day (hadn't gone anywhere. Lazy day lol) And like I said, the led went completely out as well.
Haven't had the problem again, so we'll see I guess....

Mark_Hardware said:
Idk... The phone had been plugged in for most of the day (hadn't gone anywhere. Lazy day lol) And like I said, the led went completely out as well.
Haven't had the problem again, so we'll see I guess....
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I've seen some posts about the Evo battery shutting off the charge when its being used. Were you using your Evo while it was charging?
If the battery doesn't seem to be giving you percentages that are accurate, you might want to recalibrate your battery.
Common misconceptions sticky (Evo Q&A) said:
Battery recalibration (Thanks to Cyanogen for this and to fachadick for bringing it to my attention).
If you're experiencing higher than normal battery drain, try the following:
1. Charge the phone to full battery; let it keep charging until the battery says it is fully charged. Do not just wait until the light is green, it isn't always fully charged, causing a lot of inaccuracies. (You can check by going to: Settings -> About Phone -> Status -> Battery Level = Full.)
2. Boot to recovery and wipe battery stats.
(To have the most accurate of battery stats, reboot the phone immediately after wiping the battery stats and wait for your ROM to boot completely to the desktop. Once your entire boot is done and you have full access to the phone, go ahead and pull the charger and continue.)
3. Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off. Take out the battery, and keep trying to turn on your phone until it will not turn back on at all.
4. Recharge the phone completely and then use as you normally would.
This is a method that has been proven to work, I am sure there are other ways. My battery lasts longer after doing this and the reading is much more accurate. It might be advisable to do this after every ROM install if you want the most battery life and most accurate battery reading by the phone's software.
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[Q] Strange battery percentage drain in 10 minutes.....wtf

This morning after I got ready I took my phone off the charger (it had been charging all night and was at 100%) and walked upstairs. About 10 minutes later I turned on the phone and it was at 67% and going down. I had flashed a new rom yesterday and as quick as I could I did during the drain I did a NAND restore. Could this have been actual battery drain or is there something wrong with my phone/stats. Could my phone have stopped charging at 50% and then just said it was 100%? What should I do? Is there anyway to avoid this from happening again?! I cant go to work with a battery at 50%! lol

-.- Searching is your friend.
The Evo has never trickle charged properly. Trickle charging is when you hit 100% battery while charging and the phone will continue to keep the battery charging and maintain this 100%. So 100% > 99% > 100%.
The problem is the Evo doesn't do this. Once it hits 100%, it switches to battery. It will run off the battery till it hits about 90% and then charge again. Some even say it will NEVER charge again after it hits 100%. So when you unplug it in the morning, you end up dropping extremely fast from 100% to 90%.
There are kernels in the development section that fix this issue but there are people who say it will break your phone or burn your battery out faster over time. When trickle charging, your phone will get hot as its constantly draining and charging. That can lead to a burned out battery as time goes on or a damaged phone. I personally have three batteries. I still tried to use this and noticed a drastic improvement but my phone was also pretty warm when I picked it up in the morning. Its up to you.
Also you might want to see if you have your 4G radio on. That is probably the only thing I can think of that would drain it that fast. Either that or your GPS is on and theres an app running thats using the GPS receiver.

i'd say a 30% drain in 10 minutes is unnatural. it wouldnt be myns rls4 that you flashed, would it? this is experianced by some as a "first day side effect". just fully drain and fully charge the battery a few times and you will be fine.

It could be that it just needs a couple drains and I don't want to quickly point the finger at an app that you are using. A lot of times if I actually charge my phone it will be on 92% when I wake up. 67% is a stretch unless that was 10 minutes of a game or YouTube..but still. Drain the battery a few times and see what happens.

i was thinking maybe its some kind of battery stats problem? Could that have caused it?

Phone shuts down at 14%

So, I bought another battery. Will this sort it?
Also, what's the usual procedure?
Should I charge the battery to full in the phone (turned off) then boot, set up, then charge again and reset battery stats?

The problem is that the battery control chip doesn't take into account that the battery ages.
Resetting battery stats or charging while turned off will only clear the stats you see in the settings menu. This guide will make your battery drain to 0% again: http://forum.xda-developers.com/showthread.php?t=1534892
I don't know what a new battery will do though.

I gathered that, but as the phone is going to a new user (my stepson) we got him a new battery anyway
I just wondered what the correct procedure is. I know you need to do a first charge with a new battery, as with a new phone, however, this phone obviously has a working ROM already on it.
So, the phone is charging now, switched off. Should I turn it on, use a little, then use the battery calibration app to delete the stats and then drain to 0%?

Kryten2k35 said:
I know you need to do a first charge with a new battery, as with a new phone
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Well, that assumption is probably inherited from the NiHM batteries in the past, because it's not needed with Li-Ion batteries. In fact charging to 80% is better than charging to 100% and keeping it plugged in.
You can read more about it here and here.
Kryten2k35 said:
So, the phone is charging now, switched off. Should I turn it on, use a little, then use the battery calibration app to delete the stats and then drain to 0%?
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Just charge it and use it for a full cycle. If it shuts down at 15%, you can try the battery calibration from the thread I mentioned above. If it doesn't, you're battery capacity is the same as the one the battery chip has calculated, which is good.

So, why does the first charge take so long?
This thing is still charging and it's been on the charger for 3 hours, whereas usually it'd be charged fully by now.
Been like that for every Li-Ion battery I've ever had (including my S3, took around 6 hours to charge, usually takes 3).
EDIT:
Just to clarify, I don't intend on leaving it past the green light. As soon as it says it's full I'll be taking it off charge and not trying ot overcharge it. But I still have the orange charging light after 3-4 hours.

To be honest, I don't know. Maybe it's a safety to prevent overcharging. Coincidentally, I've got exactly the same issue now. I asked about it in the calibration thread. I suppose it's normal, but I'm not sure about that.

Kryten2k35 said:
So, why does the first charge take so long?
This thing is still charging and it's been on the charger for 3 hours, whereas usually it'd be charged fully by now.
Been like that for every Li-Ion battery I've ever had (including my S3, took around 6 hours to charge, usually takes 3).
EDIT:
Just to clarify, I don't intend on leaving it past the green light. As soon as it says it's full I'll be taking it off charge and not trying ot overcharge it. But I still have the orange charging light after 3-4 hours.
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my battery took just over 6 hours to charge the other day from completly dead
Sent from my HTC Desire

Solution for battery drain on Tab S 8.4

Hi everyone.
Just to write a solution for the commonly problem on the battery of this tablet; I had the problem that battery ran out almost on 1 or 2 hours! of use after it turned off I turned on again and the gauge showed for example 30% or some cases 40% of battery I was crazy about that and had to do some research; tried to bring the tablet to warranty but they did not could help me (I don't know why) after that I read there were more users having this problem; some of them suggested to bring the tablet to a repair center or open the tablet and do some technical reparation; the solution is pretty simple that it seems to me; my solution was to open the tablet with a spudger (I don't have one so I made one by sanding a piece of plastic) after that just unplugged the battery conector and reconnected it again; rebooted if recovery mode and erased batterystats.bin, turned off and charged until 100%.
At this point I have been using the tablet by 3 days and the gauge seems to show a more precise battery percentage.

Anybody that is having battery problem, and have checked that a app is not causing the battery drain, should try the battery calibration method below, before opening their tab
Try apps like watchdog or an wakelock checker app, also any apps like alarms and weather check apps or any apps that sync the tab can keep the tab from going to sleep.
On my tab s 10.5 i only charge to 70% and never unless i am doing a calibrate drop below 20%, I use my tab for video, ebook and internet.
I use an app like Gsam to sound an alarm at 20% and 70% when charging, and i dont charge to 100% as it can cause cumulative damage to the battery, check the link below for more info on how to care for lithium based battery`s
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
John.
Below are a few screenshots from my tab s 10.5 , It has been running continuously for 142d without restart and i have a battery life of 3d21h according to Gsam app.
http://i.imgur.com/lHnGxbE.png
http://i.imgur.com/lvwv9Zm.png
http://i.imgur.com/dxfYCgJ.png
You can calibrate the battery like this before you decide to buy a new one
Fully charge the battery with the phone on and when the phone is fully charged, unplug the charger and turn it off.
When your phone is off, plug it into the charger and let it charge to 100% again. The green LED light will indicate when this is don
Next unplug the charger, turn on your phone and set the option to ensure that your screen doesn’t turn off, if you have this option. Then reconnect to the charger and wait for it to charge again to 100%.
Once charged to 100%, unplug the charger again and do not charge until the smartphone turns itself off after reaching a 0% battery level. Once off, fully charge it again and it should work properly. The screen setting can put back to normal again (meaning turn off after a certain amount of time).
phones with oled displays should not show static images for a long time as it can cause burn-in
From AndroidPit
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Tinderbox (UK) said:
Anybody that is having battery problem, and have checked that a app is not causing the battery drain, should try the battery calibration method below, before opening their tab
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I might have to give this a try. Like my battery has no problems with its connectors or anything since I have never had that problem. Recently, every time I charge my device, when it charges up to 97%, it immediately jumps to 100%. Rebooting still shows 100%. So when I turn off the device and charge it while it's off, it shows its at 98%. So I know it's an calibration problem. This only happens when charging up to 97%. So I might need to recalibrate again.
-DUHA

You should not discharge to 0% too often, as it can causes curative damage and the battery could actually fail, you would not want that to happen if you are out of warranty, I rarely discharge below 20%, a couple of % inaccuracy is not a problem really.
John.

Tinderbox (UK) said:
You should not discharge to 0% too often, as it can causes curative damage and the battery could actually fail, you would not want that to happen if you are out of warranty, I rarely discharge below 20%, a couple of % inaccuracy is not a problem really.
John.
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I hardly ever discharge to 0%, I usually charge it when it tells me my battery is low (20-15%). Well, I bought this tablet in July so I have reached probably 300+ charge cycles. I read some threads regarding battery skiping and it happens when either it's uncalibrated, or battery is slowly going bad, and something else I forget. But thanks for the tips on the battery stuff! I never knew charing and discharging fully could do such a thing!
-DUHA

I bought my device from Kuwait so it's firmware belong to united Arab of imarats.
At the beginning , I faced some issues with my device such as. After about 3 weeks I found the the battery stay only for 10 minutes even if it charged to 100%
I had to put my device in charge all the time so I can use it.
I send it to repair center and told them that I need to replace my battery.
After one day they call me and told me that it just asoftware problem and we solve it.
I got it from them use it for just 3 days and found anew problem that the home,back and multitask buttons dosen't work very well . That I need to but it on it's back or use the desktop cover to make it work.
In that point I tried another country firmware with kitkat 4.4.2 and that dosent solve anything
And when I found that the lolipop came to galaxy tab s with France and Canada and sanghfore , I installed it
I found that when I connect the wall charger , the device immediately turn off and give me the sign of battery with out any process in charging and dosent want to turn on.
And when the device work , it give me ablack screen when I shake it between my hand or but it on it's back (such like ablack screen flashing)
I don't know what to do.

Battery charge issue...

Phone was at 98% battery. Did a reboot as I do every morning, and when it started up again it showed 91% battery. I know reboots don't take 7% battery, so what gives?

My Pixel 2 XL has been having some battery reporting issues, I noticed that when I took my phone off the charger it would lose 15% very quickly then stabilize. Rebooting would also cause a drop in indicated battery %. That's my guess. Investigating to see if it can be fixed by doing a full charge/discharge cycle.

2ndammendment said:
My Pixel 2 XL has been having some battery reporting issues, I noticed that when I took my phone off the charger it would lose 15% very quickly then stabilize. Rebooting would also cause a drop in indicated battery %. That's my guess. Investigating to see if it can be fixed by doing a full charge/discharge cycle.
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I've also been seeing this issue! I will also be letting it do a full cycle today to see if it helps since it only started a few days ago.

My battery seems to be okay but my charge port when I place the cable in it doesn't feel like it fits snugly it almost has a slight wobble to it. Have you guys been noticing that as well?

I've actually been experiencing this as well for a week, I called up Verizon and they shipped me a new phone. So far no charge issue anymore on this one.

I have experienced this too

Tested this again this morning. Had the phone charging overnight.
Unplugged it, it showed 100% battery.
Immediately rebooted, and it dropped to 96%.

With a lot of phones, battery stats reset on reboot. Also- the percentage isn't a perfect science. Just let the phone do its thing. Run the battery down and recharge it. No need to reboot the thing every day.
The battery has been great for me. I use my phone extensively throughout the day, maybe 3-5 hours on time, I always make a day of use without needing to plug in. I had a light use day yesterday, and had 30% left @ 11pm, after pulling off charge the night before @ 11:30pm.

Pleased to announce that (in my case at least) doing a full cycle reset the fuel gauge and it is now working properly. I've never seen a device come with a miscalibrated fuel gauge from the factory, so that was odd. I usually keep my li-ion powered devices between 80% and 30% SoC(state of charge) to reduce cell degradation so we'll see if the fuel gauge becomes uncalibrated over time (which would be somewhat unusual) or if this was simply a software fluke.

Yea I have noticed that in my case, my phone says 100% on the charger so I will restart the phone while still plugged up and once it's booted back up it says 98% so it lost 2% while hooked up to the charger lol. Doesn't seem to affect the battery life. I'm still able to get 5 hrs of screen on time but I will try to kill it completely and charge fully today and see if it fixes it.
This morning I didn't do the restart and didn't use the phone or even turn my screen on and within fifteen minutes I turned it on to 98 % remaining.