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Battery to blame for some reboots?

just had a thought, my g2x just started rebooting like crazy i.e it would get to the tmobile g2x android start up animation and after it finishes it would reboot. my battery was around 30%-35% at the time i was thinking maybe the battery cant maintain a decent voltage and it falls below the g2x voltage threshold while under load and boom instant reboot. this could also explain why some batteries heat up to hot as well, they dont have a high enough discharge rate to keep up with the demands of the phone.
this can be solved one of two ways get a larger capacity battery of the same discharge rate. or get a higher discharge rate battery of the same size. both of those will allow the phone to draw more power without overtaxing the battery and would keep the battery cooler as well.

I wouldn't be surprised if the battery drivers are the culprit for all our issues. The phone can't properly read the battery charge and so the battery overheats or the phone reboots itself in hopes of getting a better reading on the battery.

i noticed my phone starts to heat up when the battery level hits around 40%. i never really understood why.

Mine once rebooted when it was plugged in and 100% charged. I think when it's plugged in it draws power from charger not the battery. So your theory, if true, only explains some reboots, not all.
Sent from my LG-P999 using XDA Premium App

rhinology said:
Mine once rebooted when it was plugged in and 100% charged. I think when it's plugged in it draws power from charger not the battery. So your theory, if true, only explains some reboots, not all.
Sent from my LG-P999 using XDA Premium App
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I may be mistaken, but if it was in fact 100% then it was probably drawing from the battery at that point. I believe that once they reach 100% they will cycle between battery usage and charging.

well i know from using lipo batterys in my r/c planes and cars that if you draw them below 3v it can damage the battey im not sure what Li-ion low voltage is but its near the same basicly once the battery hit around 3.6 volts at rest its empty and will not hold voltage at all.
and for the 100% full charge if the battery drivers is fubar it could be overcharging your battery and damaging it so it has less capacity so when it pulls a draw it cant keep up and reboots

I plug my phone in every day before going to bed, and unplug it in the morning. If G2x doesn't have overcharging protection my battery would have been damaged long ago.
Also, I used the phone several times when it was charged 100% and still plugged in, never saw battery percentage went to 99% then back to 100%. So I believe when 100% and plugged in, it won't cycle power source through battery and charger.
Sent from my LG-P999 using XDA Premium App

I will add a little information that may or may not have relevance. I have 4 batteries for my G2X (This is my solution to the short battery life). The LG battery, $25 AceSoft battery, and two $6 generic Chinese batteries. None of them including the dirt cheap ones cause my phone to reboot. Conclusions can be drawn from this information but I'm going to leave that up to someone else. If you want to test the battery hypothesis I suggest you buy some of those cheap batteries off of eBay and see if something changes. Would be a rather inexpensive experiment.

I agree, ever since I started using a 1900mah battery from ebay, the random reboots and freezing issues have disappeared completely, and I have been using the phone for almost a month now. Please try a different battery to get rid of random reboots and overheating issue. Hope it will help someone.
Sent from my LG-P999 using XDA App

you know what, I bought 3 ebay batteries so I can swap them around if i don't have a charger. none of them did the black lock screen. weird.

I had random reboot issues using some of the custom roms + original battery.
Then I bought a charger + batteries off ebay, and reset to original rom, and havn't had a single reboot/freeze since.

i just had my second reboot in cyanogen with my battery at 32% after if rebooted it went back up to 45%. i was playing galaxy on fire 2 when it rebooted. and according to battery monitor it was pulling 931mA when it rebooted.
i think the battery discharge rate is substandard for this phone this is a high performance phone and you cant just stick a normal cell phone battery in and expect it to work. this is in part why some of the reboots are happening and why when people got new battery they problem went away for them.

You might be on to something. Everytime my phone restarts it is because it is overheating.
Sent from my LG-P999 using XDA Premium App

i wish we had more info on the batterys lg used like the discharge rate and everything. i bet they are .5c or 1c discharge that would be why they overcheat when under heavy use or charging

I got a replacement battery from T-Mobile this past Tuesday, and had two random reboots within an hour. However, since then, I haven't had one issue. 4 days and counting going strong... Knocking on wood. Phone is stock and rooted.

well i know cm fixed the battery should be in his next build also data speeds with gingerbread, should be build 54 not 53, something is wrong with 53 and root access so they are going to have it fixed im pretty sure in 54, here peep this via twitter.........
@CM_arcee RC
My dark magical powers have beaten the G2x's radio into submission. Starting tonight, p999 gets a battery meter and twice the data speed
3 hours ago via web

while that is awsome news i dont think the battery meter for the phone is really the problem it happens when the draw on the battery pulls it below 3v under load the batterys low voltage cutoff kicks in and shuts the phone off and then the spings back up and the phone restarts

I think it could be the chargers causing issues. My gf pulled my g2x charger out of the box and said it made her phone whacky and died after a few hours.
Her comment made me think about it.
I never had battery issues but I use my old nexus one and zune charger.
Food for thought
Sent from my LG-P999 using XDA Premium App

My wall charger is bad, out bricks the phone every time I use it. Have to charge via USB.
Sent from my LG-P999 using XDA App

[Q] Nexus S battery puzzling my head

ok most of us here considered that nexus S' battery is poor compared to others, am i right?
i have lots of questions that want to clarify, these are only simple questions
1. is it ok to charge overnight the phone, despite that it dosn't reach 100%? i woke up in the morning, it's 96% percent and the status is still "charging" will it be overcharged?
2. is it ok to charge the phone when it's not yet low battery like only 50% or 80%?
3. are there any different effect of charging between pc and ac power supply except the charging speed?
4. is there a bad effect of using the phone while charging like playing games? will it lessen the battery life faster?
5. lastly, i know that as battery gets older its life also lessen because of it's internal resistance increases and it can not be stopped. my question is, is there a way to slow down this process?

I got the same issue,
got my nexus S 4 days ago and I've done two charges already, both times overnight and at morning the phone says "charged" but it is stopped at 95-96% and both the charger and the phone are completely cold so as it seems the charging is indeed finished.
Is this normal?
I've changed a lot of phones over the years but it's the first time to see something like that...

zhane0513 said:
ok most of us here considered that nexus S' battery is poor compared to others, am i right?
i have lots of questions that want to clarify, these are only simple questions
1. is it ok to charge overnight the phone, despite that it dosn't reach 100%? i woke up in the morning, it's 96% percent and the status is still "charging" will it be overcharged?
2. is it ok to charge the phone when it's not yet low battery like only 50% or 80%?
3. are there any different effect of charging between pc and ac power supply except the charging speed?
4. is there a bad effect of using the phone while charging like playing games? will it lessen the battery life faster?
5. lastly, i know that as battery gets older its life also lessen because of it's internal resistance increases and it can not be stopped. my question is, is there a way to slow down this process?
Click to expand...
Click to collapse
1. Nexus never lets the phone charge fully to 100 pct to protect damage from overcharging.
2. Yes. It is ok.
3. Speed is only difference I know.
4. It can cause temp to get high. Just be observant. If phone gets HOT, turn off the game for a bit.
5. I think it helps if you keep the battery fuller. Charge when you can and don't always let it go to 0. But I think the difference will be minimal. Anyway you should not see aging effects for something like 2 years.
Sent from my Nexus S using XDA App

bad_freddy said:
I got the same issue,
got my nexus S 4 days ago and I've done two charges already, both times overnight and at morning the phone says "charged" but it is stopped at 95-96% and both the charger and the phone are completely cold so as it seems the charging is indeed finished.
Is this normal?
I've changed a lot of phones over the years but it's the first time to see something like that...
Click to expand...
Click to collapse
Different phones handle it in different ways. For example HTC devices charge to 100 pct then stop and allows battery to drain (even while still on charger) to 90 pct before charging kicks back on again. Samsung, phone just stops before 100 pct and alternates charging / not charging. The problem is li-ion battery can be damaged by overcharging.
Sent from my Nexus S using XDA App

thanks! for the fast answers!
so it would be best to charge as much as possible even if it is not low battery yet and not allowing to totally deplete the battery,
tnx a lot mate!

Infuse charging stopped

I had the infuse on the AC charger the other day, when I took it off, it had a message stating charging stopped because of battery temperature. Now battery will only charge to 35% no matter how long its plugged in. Also when phone is off the charger, phone is getting very warm to the touch and the phone is not being used. Do you think I need a new battery or is the charging circuit messed up? Thanks for any input!!!
Sent from my SAMSUNG-SGH-I997 using XDA App

If your able to plug it in and it shows it's charging then there is noting wrong with the circuitry. Your gonna need to replace the battery.

A new battery is much cheaper than a new phone.
Batteries heat up as the internal resistance increases over time. As Axiomkid suggests, get another battery. Do it soon. Old (or defective batteries) overheating run the risk of shorting, leaking, or exploding.
Better yet get two batteries and maintain them properly ie discharge to 10%, recharge to 100%, then swap out with another battery and let the recharged battery cool down.

Tried a new battery, it charged to 100%... but drained 50% in one hour. When I charged it again same problem is still happening. Thanks for all that helped.
Sent from my SAMSUNG-SGH-I997 using XDA App

You might need a new charger too. are you using the original Samsung charger? Try charging it from a PC too. The 50% drop in the charge could be a calibration issue too. It would improve that reading over the first few charges with the new battery.

yes i am using original charger, i have use a captivate phone charger as well. i think they are both the same. i'm thinking something is wrong with the phone because after charging and taking the phone off, the phone is getting really hot without being on the charger. like the phone is being used but it's not. could maybe the rom cause an issue like this? i'm thinking maybe trying to flash the phone with a stock rom and see how much the battery drains

Problem solved!!! Reflashed ROM and all is good
Sent from my SAMSUNG-SGH-I997 using XDA App

Glad to hear your problem is solved! Was that the root cause with your first battery as well?

Battery charging slow after one point

Hey guys,
You can see the problem in the Screenshot. At one point the phone stops charging fast and goes on charging very slow. It looks like the phone thinks the battery is full and minimizes the charging power. It is a 1500mah battery, bought a few days ago. I also calibrated the battery at 100% in the 4ext recovery. CM 10.2 from 08.08.
Sent from my Nexus 4 using xda app-developers app

Provably not a problem at all. My guess would be that the battery or charging circuits were getting too hot so it dropped the charging current - fairly normal behavior.

The phone is staying completely cool. I think the calibration is wrong. It is supposed to charge slower at 90% Not something like 50
Sent from my Nexus 4 using xda app-developers app

I suspect a cheap battery... What brand is it?

Its a german brand MTec, oder via ebay.

I've noticed my battery does the exact same thing. Charges quickly to around 50% and then very slow for the remaining 50%. I'm using the original HTC battery that came with my Desire S so I just presumed that it was either the due to the battery aging or perhaps due to the CM 10.1 I'm running. Can't say I noticed this charging behaviour before I used CM 10.1 but I didn't immediately notice it after flashing either.
My phone takes around 8 hours to do a full charge. I've noticed that I can get it to charge to 100% more quickly if I let it charge to near 50%, unplug it and leave it for 5/10 mins, then plug it in again. It's starts off with a fast charge again. It slows after a while but overall it's a quicker way to get to 100%. It's probably not the best thing for your battery to do that regularly so I don't do it unless I need it to charge quickly.

[Q] Battery Drain while Charging Nexus 5

This problem was there since i bought the nexus 5 (first week of jan), but it used to happen seldom, like once a week or so. But since last 2-3 weeks, everytime i try to charge my phone, it doesn't charge and actually starts discharging and reaches 0% in some time while charging, one way i have found to solve it is to switch off the phone while charging, let it charge like that for 5 mins, and then switch back on, it gains 1% during that time, after that it charges normally.
Using original charger and USB cable that came with my nexus 5, tried using samsung charger and HTC cable with HTC charger as well as OEM charger, doesn't make a difference.
Also, since i bought the nexus 5, if the USB cable is even slightly displaced (like when picking up the phone), and phone disconnects and reconnects from charging, like the port on the phone is loose or something, this annoys me while transferring data from pc as if the phone is even slightly moved, then the Internal Storage unmounts and remounts on the pc, thus interrupting the transfer. Though this problem i have noticed is slightly higher when phone charge is on the lower side (~20%) and if i try to fiddle with the USB cable while the charge is >60%, the problem doesn't seem to be that much, though it still disconnects, but not that sensitive.
Can anyone explain what's going on?

Does the mobile display that the phone is actually charging when you have connected it to the charger??
As for your second problem, I'm sure the micro usb port of your device has become loose... Nothing you can do to fix it... May be visit a local LG centre and tell them to see if it can be fixed by opening up the device and tightening it may be?
PS: lol @ username are you Indian?
Sent from my Nexus 5 using Tapatalk

vin4yak said:
Does the mobile display that the phone is actually charging when you have connected it to the charger??
As for your second problem, I'm sure the micro usb port of your device has become loose... Nothing you can do to fix it... May be visit a local LG centre and tell them to see if it can be fixed by opening up the device and tightening it may be?
Click to expand...
Click to collapse
Yes, the phone says charging, battery settings says Charging (AC), but it doesn't charge, and discharges, i don't think that some app is using high cpu while charging, because my battery discharges fine before i put it on charge.
I purchased it from Play Store, so LG would fix it then too?
vin4yak said:
PS: lol @ username are you Indian?
Sent from my Nexus 5 using Tapatalk
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Click to collapse
uhm yes, well i hope the moderators don't take it too seriously..

madarchod said:
Yes, the phone says charging, battery settings says Charging (AC), but it doesn't charge, and discharges, i don't think that some app is using high cpu while charging, because my battery discharges fine before i put it on charge.
I purchased it from Play Store, so LG would fix it then too?
uhm yes, well i hope the moderators don't take it too seriously..
Click to expand...
Click to collapse
Are you fully stock? If so, then perform a factory reset and see whether the issue persists. If you're using a custom rom then flash the factory images and go fully stock and see whether it still occurs.
If it does, then it's surely a faulty battery we are looking at. Since you've tried using different chargers and cables, there's nothing more you can do.
Call google customer service and RMA it.
Sent from my Nexus 5 using Tapatalk

vin4yak said:
Are you fully stock? If so, then perform a factory reset and see whether the issue persists. If you're using a custom rom then flash the factory images and go fully stock and see whether it still occurs.
If it does, then it's surely a faulty battery we are looking at. Since you've tried using different chargers and cables, there's nothing more you can do.
Call google customer service and RMA it.
Sent from my Nexus 5 using Tapatalk
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Yes, i am running stock rom with root, tried factory reset, no improvement, currently my phone is on charging with 71% charge, now i am using my phone, testing new camera app, no disconnections, but when i use the phone with low charge while charging, it disconnects and reconnects, don't know if it's hardware fault or just software, as charging too returns to normal when phone is switched off and then turned on.
Is RMA'ing the last resort? coz i am afraid that RMA might lead to some other problems, like getting a replacement with screen bleed issue or some else issue.

madarchod said:
Yes, i am running stock rom with root, tried factory reset, no improvement, currently my phone is on charging with 71% charge, now i am using my phone, testing new camera app, no disconnections, but when i use the phone with low charge while charging, it disconnects and reconnects, don't know if it's hardware fault or just software, as charging too returns to normal when phone is switched off and then turned on.
Is RMA'ing the last resort? coz i am afraid that RMA might lead to some other problems, like getting a replacement with screen bleed issue or some else issue.
Click to expand...
Click to collapse
Yes, what you've said is very true. The replacement device might have other problems if you're unlucky.
Are you on stock kernel or have you flashed a custom kernel? If you have then flash the stock boot.img and see.
If everything else fails you can flash the factory images from Google and go completely stock and see if the problem persists.
It's upto you to decide whether you can overlook this weird battery issue or not. If you can't, then RMA is the only option left.
Sent from my Nexus 5 using Tapatalk

vin4yak said:
Yes, what you've said is very true. The replacement device might have other problems if you're unlucky.
Are you on stock kernel or have you flashed a custom kernel? If you have then flash the stock boot.img and see.
If everything else fails you can flash the factory images from Google and go completely stock and see if the problem persists.
It's upto you to decide whether you can overlook this weird battery issue or not. If you can't, then RMA is the only option left.
Sent from my Nexus 5 using Tapatalk
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Click to collapse
hmm yeah, i would need to think about it, thanks for the help.. :good:
i think i'd wait for 4.4.3 first to see if it isn't a firmware issue.

This results are from my tests.
If your current CPU operating temperature is higher than 51 degrees celsius the phone won't charge,it will stay at for example 50% .
If the temp. Is higher than 51 degrees the batt% will decrease.
If the temp. Is below 45 degrees the battery will charge but very slow.
If you're gaming it's normal.
Leave your phone to cool down for 20 minutes and it will start to charge at normal tempo,1-2% per minute at 20.degrees celsius.
Sent from my Nexus 5 using Tapatalk

gajkax said:
This results are from my tests.
If your current CPU operating temperature is higher than 51 degrees celsius the phone won't charge,it will stay at for example 50% .
If the temp. Is higher than 51 degrees the batt% will decrease.
If the temp. Is below 45 degrees the battery will charge but very slow.
If you're gaming it's normal.
Leave your phone to cool down for 20 minutes and it will start to charge at normal tempo,1-2% per minute at 20.degrees celsius.
Sent from my Nexus 5 using Tapatalk
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Click to collapse
hmm, quite interesting statistics there.. :good:
i'd test for the temps and see if this problem is because of the temps or not.. :highfive:

gajkax said:
This results are from my tests.
If your current CPU operating temperature is higher than 51 degrees celsius the phone won't charge,it will stay at for example 50% .
If the temp. Is higher than 51 degrees the batt% will decrease.
If the temp. Is below 45 degrees the battery will charge but very slow.
If you're gaming it's normal.
Leave your phone to cool down for 20 minutes and it will start to charge at normal tempo,1-2% per minute at 20.degrees celsius.
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
Whattt?? I have put my phone on charging while playing heavy games like mc4 where the temp easily reaches 50+*c and I haven't seen any interruption in battery charge..
Are you sure about this??
Sent from my Nexus 5 using Tapatalk

In my case the battery isn't charging or it's charging BUT at 1 percent in 7-8 minutes when CPU temp. Is 51-52 celsius or above.
Sometimes when it's above 55 celsius,battery percentage is going down.
I'm charging with the original charger and cable.
I,m not using usb fast charge hack.
Sent from my Nexus 5 using Tapatalk

gajkax said:
In my case the battery isn't charging or it's charging BUT at 1 percent in 7-8 minutes when CPU temp. Is 51-52 celsius or above.
Sometimes when it's above 55 celsius,battery percentage is going down.
I'm charging with the original charger and cable.
I,m not using usb fast charge hack.
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
Yes, that's normal. It will charge if the temp is above 50*c..it will charge slowly as you are using your phone for hd gaming which takes a toll on the battery..
Fast charge just means that you can charge via your computer at AC wall charging speed...
If you charge your phone via computer and play games on it simultaneously then it's normal to discharge while charging as usb charges only at 0.5amp
Sent from my Nexus 5 using Tapatalk

gajkax said:
In my case the battery isn't charging or it's charging BUT at 1 percent in 7-8 minutes when CPU temp. Is 51-52 celsius or above.
Sometimes when it's above 55 celsius,battery percentage is going down.
I'm charging with the original charger and cable.
I,m not using usb fast charge hack.
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
ok, so after some days of testing, i can say that this problem is irrelevant of temps on my device, sometimes it charges without any nags, but most of the time it discharges while plugged in, and i have to reboot the phone.. :crying:

madarchod said:
ok, so after some days of testing, i can say that this problem is irrelevant of temps on my device, sometimes it charges without any nags, but most of the time it discharges while plugged in, and i have to reboot the phone.. :crying:
Click to expand...
Click to collapse
This happened on my last phone. For me, it was from using a USB fast charge option on a custom kernel: reflashed the kernel and charging was back to normal; selected the option and it duplicated the problem.
So:
Are you using a stock kernel? Either way, I would try wiping caches and flashing the kernel (or another one).
Or, if you haven't, try a simulated battery pull (hold down the power, volume up and volume down buttons for ~15 seconds).
Sent from my Nexus 5 using XDA Premium 4 mobile app

I know when I'm using my phone as a sat nav on the car dash it can get pretty toasty. When it's like that, it is on charge but the phone will still drain slowly... so on a 3 hour journey it may lose 20% battery or something. That is with an official HTC car charger so perhaps the results are a little unfair - think it's rated 1 amp.

ihitcows said:
This happened on my last phone. For me, it was from using a USB fast charge option on a custom kernel: reflashed the kernel and charging was back to normal; selected the option and it duplicated the problem.
So:
Are you using a stock kernel? Either way, I would try wiping caches and flashing the kernel (or another one).
Or, if you haven't, try a simulated battery pull (hold down the power, volume up and volume down buttons for ~15 seconds).
Sent from my Nexus 5 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
hmm, yeah, using the stock kernel, was waiting for 4.4.3 before flashing with custom kernel, will try though, thanks.. :good:

Sure sure! Does it seem like it only charges when it's off?
Sent from my Nexus 5 using XDA Premium 4 mobile app

ihitcows said:
Sure sure! Does it seem like it only charges when it's off?
Sent from my Nexus 5 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
yeah, while discharging, no matter how many times i re-insert the cable, or change the charger or the cable, it won't charge unless i switch off the phone, let it charge for some minutes and then power it on, it'll start to charge normally after that..

I'm in a similar boat. Every now and then I'll wake up with the battery being only charged to 75 or so. Since it happens sporadically it's hard to test why it may be happening. Have you found any resolution for the issue? This is using a wireless charger so a bad USB port can be ruled out.
Sent from my Nexus 5 using XDA Free mobile app

prsterero said:
I'm in a similar boat. Every now and then I'll wake up with the battery being only charged to 75 or so. Since it happens sporadically it's hard to test why it may be happening. Have you found any resolution for the issue? This is using a wireless charger so a bad USB port can be ruled out.
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
The Nexus 5 has a charging controller by TI, that regulates the voltage and current to the battery if the battery gets hot enough lets say 50C it will stop all charging untill the battery is cooled and the charging session is re-started
The battery also has a fail-safe measure to prevent the phones battery from exploding which also does what the charging controller does, incase it fails the battery has another fail-safe mode