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[Q] LG G2 turns off at 40% battery, won't turn back on

My LG G2 (verizon) turns itself off and will not turn back on when the battery reaches 40% capacity (or sometimes in the 20 to 30% range). When I plug it into the charger, I am turn it on and use it again, and it indicates that the battery is not fully depleted. It also seems like the battery is depleting more quickly than usual during use (web browsing).
In short, the phone behaves like the battery is dead, while indicating that it still has a significant charge left.
Are there any tests I can run to identify the problem? Or other troubleshooting tips to resolve the issue? Thanks for your help.

Battery most likely busted. Abnormal reading of the battery is a common symptom. Had it before on a HTC one..

This problem coincides with the installation of the new Lollipop OS also.
I started the upgrade, then realized it was 640MB and I wasn't on wifi, so I cancelled it. The problem started around then. I have since completed the upgrade with no improvement in the battery issue.

Note 4 sudden battery drop

I bought a 1 year old note 4,it usually dies at 25% percent,it drops suddenly to 0 %.,after weeks of research i found it is caused by faulty battery so i bought a new battery now it dies at 10% to 0% in seconds and turns off,i flashed a kitkat rom now problem is solved but i want to be on lollipop due to UI changes,can any custom rom solves this? i've tried dr.ketan rom,same issue dies at 10%...

Maheshzx said:
I bought a 1 year old note 4,it usually dies at 25% percent,it drops suddenly to 0 %.,after weeks of research i found it is caused by faulty battery so i bought a new battery now it dies at 10% to 0% in seconds and turns off,i flashed a kitkat rom now problem is solved but i want to be on lollipop due to UI changes,can any custom rom solves this? i've tried dr.ketan rom,same issue dies at 10%...
Click to expand...
Click to collapse
Probably caused by battery calibration. Just use your prior rom from 100% to when it shuts off a couple of times to retrain it.

If you use multiple batteries like I do, you'll never be able to calibrate, and will just have to live with this issue.
Sent from my SM-N910T using Tapatalk

rcobourn said:
If you use multiple batteries like I do, you'll never be able to calibrate, and will just have to live with this issue.
Sent from my SM-N910T using Tapatalk
Click to expand...
Click to collapse
Well not entirely true. Ur battery have the chip that tells the system how much left the battery is. I often have those prob. But now is gone. I just charge until 100% let it 10min charged. Then use it until it off. (Really really off.) Like when the battery circuit stop the battery not the phone shutting down. After that charge until 100% and after 100% i let it charge for 1hour to make sure it really 100% . done

Same here after last update. From 10 to 0% in second

+1 here
Thats why I utterly I hate sw updates.
My Galaxy NOTE 4 SM-N910C

Same problem here ,, considering buying a new battery but afraid that the problem isn't from the battery and get the same drop again with the new on
my phone is 1 year old

i had the same problem, so what i did was to flash the Rulinglite ROM for my note 4 910 C. it works fine now.

Hey guys, I got the same problem. Sometimes it drops from 15% to 4% in a few minutes and then from 4% to 1% in another few minutes (without using phone ofc).
Also, when i charge my phone - it shows me 100%, but when i reboot it - i got like 94%. Few minutes later - again 100%. After reboot - 95%.. etc etc etc... (charger is pluged on for all this time)
Do you have this problem?

danterape said:
Hey guys, I got the same problem. Sometimes it drops from 15% to 4% in a few minutes and then from 4% to 1% in another few minutes (without using phone ofc).
Also, when i charge my phone - it shows me 100%, but when i reboot it - i got like 94%. Few minutes later - again 100%. After reboot - 95%.. etc etc etc... (charger is pluged on for all this time)
Do you have this problem?
Click to expand...
Click to collapse
Same problem here

my problem is that the battery percents are getting lower ery fast..if i make some actions that require more battery and i have 20% of battery, the percent goes to 16 so quickly and then the phone hangs up. I turn it on, it shows lesss battery, then it hangs up again and i need do recharge the battery. I bounght the phone at 2nd hand, i noticed the battery issue since i was testing it, but i love the phone. i am affraid not to be a hardware problem with one of the internal components of the phone, that killed the battery...i tested the battery on Note 3 and i am sure that the battery has a problem. What if i buy a new battery and a malfunctioning component of the phone damages the new battery too?

For me: i will dial *#0228# press quick start and wait till phone lids up connect charger and charge until 100% and then dont unplug first leave it there for 30mins or more and then unplug. ( do not unplug it halfway )
Second i switch off my phone take out battery and wait around 3 mins and then put back in and start charging it to 100% without switching device on, also same thing leave for sometime before unplug when it reaches 100%. you can also switch on after 100% and wait for sometime. ( as booting phone drains battery too )
hope it helps

Bought a new battery still drains at 10percent exactly,thought it's a lollipop issue,but even in MM it exactly shuts off at 10%.

Random turn off

Hi,
I have a Note 4 SM-N910C variant that is almost 3 years old.
Starting from 5 months ago the battery level would start dropping fast from 35% to 0% in like 2-3min after which the phone would turn off. If i took out the battery and insert it again, start the phone again it would show around 30% battery level. After a while it would start doing the same fast drops in battery level and so on.
I got a new battery, not OEM and now it doesnst do what i was facing above but it randomly turns off no matter if im doing something with heavy or no load on the device.
The turning off usually happens after the device goes bellow 50% battery level.
How can i test if all the components are ok other than the battery which seems to be faulty in my opinion.
I did order a new original OEM battery but it will take time to get to me.
I want to find out if the rest of the components are functioning without faults so i can decide whether i should get a new phone or not.
Please assist.

New battery

I know its not the same behavior, I have 2 note's. Mine is only a couple of months old while the one from my wife is build in 05/15. Her phone when we just received it would refuse to charge above 96%. Sure the phone would say 100% but as soon as you unplugged the charger it would drop straight to 96%. It did this on 3 different batteries, exactly the same behavior. All these batteries are OEM. When you plug it in it would go rapidly to 100%..
Anyway, I wiped the cache on that phone and since this it charges normally.
Been comparing the battery drain and both phones are using around 6 to 8% per night while on stby with wifi on.
Just try this, it may help you!

Thanks for the replies.
I did try wiping the cache and even did a factory reset.
I rooted the phone 2 days ago to try and recalibrate the battery but i didn't help.
I think the situation isn't degrading cause from today the phone is constantly hot and the cpu is running at around 48 celsius with 7-8% load.
I'll see what happens when the new battery arrives, maybe the phone is heating up cause of this maybe not. It's even eating the battery from 100% to 0 in 2h with no real load on the phone.
Do you guys think a benchmark program will force it to thermal shutdown if this is the issue.
I'm still trying to find out if only the battery is faulty or i have a dying phone.

To me you have 2 problems...a faulty battery and a (new) software problem on your phone.
Constant being warm with a cpu load tells me something on your phone is running all the time consuming your battery and causing your phone to heat up, unless it behaved the same before the factory reset and rooting?
You are rooted so try Wakelock detector for root to see which app (if any) is causing your phone to behave like this.

I will try wakelock to do its thing during the time i sleep. But if that doesnt help ill try a custom rom. Im not gonna factory restore and go back to stock rom. Gonna move away from that and see what happens.

Moto g4 randomly shutting down at any given time

Hi there,
Since a few days my Moto G4 has been randomly shutting down (instantly) at any given moment. Battery charge does not matter. 100%, 20%, all the same. Sometimes when it has shutten down and i boot it up again, the phone says that the battery is 1% or something low, but when i put it on the charger it quickly goes back to whatever it was. I have tried installing a different rom but that didn't work.
How can i fix this?

Nanoxic said:
Hi there,
Since a few days my Moto G4 has been randomly shutting down (instantly) at any given moment. Battery charge does not matter. 100%, 20%, all the same. Sometimes when it has shutten down and i boot it up again, the phone says that the battery is 1% or something low, but when i put it on the charger it quickly goes back to whatever it was. I have tried installing a different rom but that didn't work.
How can i fix this?
Click to expand...
Click to collapse
Restore back to stock rom, calibrate battery, and if still no better, change battery as it likely is bad

Nanoxic said:
Hi there,
Since a few days my Moto G4 has been randomly shutting down (instantly) at any given moment. Battery charge does not matter. 100%, 20%, all the same. Sometimes when it has shutten down and i boot it up again, the phone says that the battery is 1% or something low, but when i put it on the charger it quickly goes back to whatever it was. I have tried installing a different rom but that didn't work.
How can i fix this?
Click to expand...
Click to collapse
My son's G4 had the same exact symptoms. Random reboots from any battery level. Typically after boot the battery level would drop dramatically from e.g. 80% to 5%. Extremely fast battery level drops after charging. Abnormally fast charging to full etc.
Send it in for repair and got it back after 5 days or so - everything fixed. Very likely bad battery or connection to battery.
If you are already on stock then definitely get it repaired. If out of warranty you can try to replace battery yourself, available on ebay and instructions on youtube.

Battery indicator problem

Hi my gt-i9301i seems to be having problems with the battery indicator, from 100-50% it is working okay but when it gets below 50 it freaks out, it immediately drops to 14% then skips to 7% and after two or three minutes it turns off. When I remove the battery and put it back in after a minute it goes back to 27% but then does the same, drops immediately to somewhere near 7% and dies again. What can be the problem, I tried different batteries, calibrating the battery by dropping to 0 then back to 100 and using a battery calibration app (root) but nothing fixes it. It doesn't matter if it is the stock firmware 4.4.4 or lineageos 17.1, it does the same thing on both. Anybody know a solution? I get 2 hours SoT (screen on time) and this is not enough to get me through the day and it is my daily driver since I'm a student and I currently don't have enough money for a new phone.
Just to mention, it's not because it's set to Performance mode, it does the same on Balanced too. Battery saving mode makes the phone unusably slow.