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Phone turning off at 50% battery life

For the last week or so, I've noticed that my phone now powers off at 50% battery life.
Battery Monitor Widget reports the battery still having ~1000mah at this level, but the phone just dies. I feel like this is incorrect, because sometimes if I run it down slow near 50%, it will do that thing where it will flash RED on the LED when you plug it in for the first time (super low battery indicator).
I'm running AOKP 4.2.2 MR-4, but i've tried a few different roms, dirty and full wipe (factory clean), along with various kernels, but my phone continues to die at 50%.
Any ideas on how to fix this?

See attached screen shot for what I"m talking about. Battery drain will look fine, then all of a sudden, BOOM 0 percent, and I have to charge it.
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Yikes, definitely something going on there. Are you running a custom Rom?
Sent from my Nexus 4 using Tapatalk 2

thatguy188 said:
Yikes, definitely something going on there. Are you running a custom Rom?
Sent from my Nexus 4 using Tapatalk 2
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Just went completely back to stock and then put the latest AOKP back on. Still seeing some weirdness. It's like it doesn't even use half the capacity of the battery (see discharge/charge graph)

h41cyon said:
Just went completely back to stock and then put the latest AOKP back on. Still seeing some weirdness. It's like it doesn't even use half the capacity of the battery (see discharge/charge graph)
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If I had to guess, I would say you battery stats file is out of sync. After flashing different ROM's on a G1, I would have to re-calibrate the battery stats by letting the phone battery slowly die (phone powers off), then fully charge while phone was still off (8-12 hours), turn back on and repeat one more time. The stats file would fix itself.

I'm experiencing the same issue, but mine is not as severe. I've dropped as much as 25% battery, but the phone has never reached auto shut down. I'm worried that this issue will cause the red light of death.

SpookyTunes said:
If I had to guess, I would say you battery stats file is out of sync. After flashing different ROM's on a G1, I would have to re-calibrate the battery stats by letting the phone battery slowly die (phone powers off), then fully charge while phone was still off (8-12 hours), turn back on and repeat one more time. The stats file would fix itself.
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Click to collapse
yea def sounds like battery stats not updating properly

[Q] Device crashing and full battery drainage

Hi guys,
My device has started acting pretty weird for the last couple of days.
Firstly it started with sudden crash and reboot. I was shooting burst 20 images when it happened.
After the reboot, the battery went from about 70% , showed 0% and went into boot-loop, showing 0% battery every boot.
The only thing that helped was removing the battery. After a fresh start, the battery showed about 50%.
I tried to reproduce the same thing (shooting in burst mode) but couldn't repeat that error.
Then, after a few minutes, it happened again and again and again. (screenshot attached)
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I reflashed original ROM and reset to factory settings. Thought that this would solve it.
Today I had something new, same thing with the sudden crash, after recording a video.
The device crashed, restarted with battery @ 0% (previously was ~55%) and went into boot-loop, showing 0% battery every boot.
After removing the battery, the device showed 25% battery. After a few times that I removed the battery, the device showed 20% and again, boot-loop.
When I connected the charger, it started charging and I got to ~35% of battery.
After rebooting the device, it suddenly showed ~50% battery.
The jump is visible at the attached screenshot:
I have a 32gb sandisk ultra type 10 memory card. I heard that they may cause lagging on the device.
Also, the battery seems to be OK, not spinning on the table.
When connected to the charger, the problem doesn't seems to be happening.
Please, any suggestion will be appreciated.
I am very frustrated.

same ****ing problem . Hope someone will solve this ****ing issue .

Maybe its a defective battery. Check if your battery have a lump or not.
Sent from my GT-I9505 using xda app-developers app

The battery appears to be in good shape. No bumps and not bloated.
I was at the service center yesterday evening.
They installed the official ROM and did factory reset.
As the device turned on - surprise! Battery shows 0%.
Their suggestion was to replace the battery charging port flex cable and provide a new battery.
Today I shall leave the device for the procedure and report back after they finish to see if it works.

Look like hardware issue
Sent from my GT-I9505 using XDA Premium 4 mobile app

I do hope that this will solve the problem.
Although, I see more and more users are posting about this same issue.

So, got my SGS4 couple of days ago.
What they did was changing the battery and reset the device.
It seems that the battery life got longer and it holds almost for the whole day.
I disconnect it from the charger with 100% at 5:30 ,
and I have around 20% left when I go to sleep at around 23:00
I use the device on medium level. I do have phonecalls and whatsapp majorly.
Today, I read an article that Samsung admits having problems with the SGS4 battery and offers free battery replacement.
http://goo.gl/YoFDFB

[Q] Kernel is Consuming 80% of the Battery

Hi there. Could anyone check what is wrong with my phone please? I had it at 100% at around 1pm today. Been using WIFI at the office(no data btw), internet browsing for about 5 minutes every hour, screen brightness always at 20%. Good phone radio signal. However, I noticed something is wrong. I a bit surprised it already consumed 30% of power in a matter of 2 hours. It usually consumes 20% battery every 5 hours, and that includes 5 minutes of Clash of Clans, 10 minutes of net browsing and FB in an hour. But today I just let it sit on the table and check the drain. It's like losing 1% every 5 to 10 minutes:
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My charging habit though, I let it go down between 10% to 20% before I charge, sometimes I forget to pull it from the socket for 30 minutes (do all modern gadgets have safety off feature?), and sometimes I charge it to full even if it has still 60% remaining. I got the phone last November 8. It shouldn't be discharging this fast, right?

To the charging part: you can charge your phone whenever you want! the only thing that these batteries dont like is getting it under 15% and letting it charging after it reached 100% for too long but no matter if you have 60% or 20% you can charge it
Lithium batteries info

Kalaidos said:
To the charging part: you can charge your phone whenever you want! the only thing that these batteries dont like is getting it under 15% and letting it charging after it reached 100% for too long but no matter if you have 60% or 20% you can charge it
Lithium batteries info
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But why is it draining too fast while on wifi only?

Anyone? Been searching the net but couldn't find any answers.

If nothing helps, try performing a factory reset.

The weird thing is, this happens only when i am using the office wifi. At home, i get only 3% drain overnight.

Look at "Held Awake". Use BetterBatteryStats to find out which app doesnt allow your phone to sleep.

yonba said:
The weird thing is, this happens only when i am using the office wifi. At home, i get only 3% drain overnight.
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I had the same problem on my work wifi and it was because of the way the wireless access point is set up. The router sends broadcast msgs to all the clients, sort of a keep-alive ping, therefore draining your battery, since the phone responds to those broadcast msgs and it never allows the wifi to enter power save mode or sleep.

[Q] Battery Calculation Broken?

This has happened multiple times on my Galaxy s4. Today was the worst however. My phone was on 51% battery (supposedly) and then, the phone just turns off while I was in an app, without any kind of low battery warning, it was running as normal before this happened, I start the phone up again and bam, 1% battery remaining. Here it is on the battery screen:
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My battery was dead by 2pm in the day which is also significantly worse than normal. This is with just 45 minutes screen on time:
and just 7 hours on battery:
And with no apps sucking up battery life.
Has anyone had this issue before and is there any possible way to fix this?

Charge to 100%. Pull battery. Put it back in and charge it again while off to 100%. If that doesnt fix it then get a new battery.

epicflyingcat said:
This has happened multiple times on my Galaxy s4. Today was the worst however. My phone was on 51% battery (supposedly) and then, the phone just turns off while I was in an app, without any kind of low battery warning, it was running as normal before this happened, I start the phone up again and bam, 1% battery remaining. Here it is on the battery screen:
View attachment 2850747
My battery was dead by 2pm in the day which is also significantly worse than normal. This is with just 45 minutes screen on time:
View attachment 2850751
and just 7 hours on battery:
View attachment 2850748
And with no apps sucking up battery life.
View attachment 2850750
Has anyone had this issue before and is there any possible way to fix this?
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Click to collapse
Hi ,
It could be lots of things...battery , phone not going in deep sleep , settings
First thing I would do is use an app like Better Battery Stats and really see what is going on ( kernel wakelocks) , who is keeping the phone up all the time , then i would review all my settings like FB , mail , location ...any syncing related app that may be going crazy and of course battery may be going bad

Look like a bad/faulty battery for me.
Sent from my GT-I9500

Keep in mind that battery percentage is never 100% accurate. All devices with batteries (with a percentage meter) has this.
But yeah, use better battery stats to check wakelocks.
Also a trick to calibrate the fuel gauche chip is to take out the battery for 3-5 minutes. It will be more calibrated than before.

Incorrect Battery Reporting | % Skipping | Dead @ 12%

Battery would fall 2% on the screen, it shows in battery reporting you can see the line drops steeply within 1 minute then stays stable (ignore the part where my device was asleep).
been very inaccurate with reporting % it randomly died at 12% (lowest its been since i got it 3 weeks ago) and when i power back on its at 2%. i charged back up to 40% and let it drop to 12% and the same happened.
i could live with the 3hr SOT if i got a good report of how much % was left so i can conserve usage if need be.
Running stock oxygen 2.1.1
then rooted and installed AK kernel (SOT is a little better) but still % dropping. i even super underclocked and saw the same effect
sent a ticket to OP - hoping its a defect and they can replace it
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LOGMD said:
Battery would fall 2% on the screen, it shows in battery reporting you can see the line drops steeply within 1 minute then stays stable (ignore the part where my device was asleep).
been very inaccurate with reporting % it randomly died at 12% (lowest its been since i got it 3 weeks ago) and when i power back on its at 2%. i charged back up to 40% and let it drop to 12% and the same happened.
i could live with the 3hr SOT if i got a good report of how much % was left so i can conserve usage if need be.
Running stock oxygen 2.1.1
then rooted and installed AK kernel (SOT is a little better) but still % dropping. i even super underclocked and saw the same effect
sent a ticket to OP - hoping its a defect and they can replace it
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By what I read, it's a normal behavior when device wakes up from sleep.
It seems that, when device is asleep, even battery stats aren't updated, to avoid unnecessary drain. So, once it wakes up and you use it for couple minutes, android get a chance to record stats and update actual battery percentage.
Again, this is the explanation I read on such a question, and it does makes sense.

Hetalk said:
By what I read, it's a normal behavior when device wakes up from sleep.
It seems that, when device is asleep, even battery stats aren't updated, to avoid unnecessary drain. So, once it wakes up and you use it for couple minutes, android get a chance to record stats and update actual battery percentage.
Again, this is the explanation I read on such a question, and it does makes sense.
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i managed to underclock enough to make the other percentages to show up - so it is working just i guess polling is slow.
the 12% dead battery isnt normal though. havnt had it since then but if reset a few times. now switched to a custom rom (keep loosing LTE) but ill figure it out, thanks!