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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.
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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.
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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.
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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.
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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.
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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
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My wall charger is bad, out bricks the phone every time I use it. Have to charge via USB.
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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!!!
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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.
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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
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Glad to hear your problem is solved! Was that the root cause with your first battery as well?

Help! Phone won't charge

This has been a somewhat recurring problem since I got my phone. Some nights when I put it on the charger the battery icon will show that it is charging, but when I wake up it will be at 30%. I have to take the battery out several times before it actually charges. It did this a few nights when I first got it, but then it got better for the next couple months and now it's doing it again. I'm running CM7 with Da_G's kernel and haven't changed anything since the first successful flash. I'm also using the same battery and charger that came in the box.
I noticed that the battery is rated 1850 mAh and the sticker on the inside cover of my phone is rated for 1500 mAh, would that be a problem?

Maybe you just have a junk Battery? I would try another one. (and that way at a minimum, you have a spare)
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Try this: go to your dialer and dial *#*#4636#*#* and tap battery information. There's a couple things to look at on this screen, first of which would be battery health. If it says anything other than good, try resetting your phone. If it says good, then plug in your charger and look at the battery status field. It should say charging. If it says discharging, try a different charger. If it's still discharging on a different charger, do a master reset and try again. If it still discharges after the master reset, you should look at getting your phone replaced.

It says the battery is in good health and that it's charging, but it's been stuck on 29% for about 30 minutes now. I'm thoroughly confused.

Did you try a different charger?
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If you tried a different charger and the factory reset didn't make a difference you should look at replacement.

Yup, try a different charger. Samsung oem usb cables have had some issues.
And if that's the case you should get a free replacement from AT&T. And get a replacement battery while you're at it, always good to have a spare...

Firedcylinder said:
Did you try a different charger?
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I used my charger from my old phone and also my car charger and it just seems to be random when the battery decides to charge. There's no definite way to get it to charge, I just have to plug it in and hope for the best and maybe do a few battery pulls. Sounds like I'll have to buy a new battery.

Don't buy one, that's a warranty replacement. And if that doesn't work get a replacement device. Something is defective.
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skrambled said:
Don't buy one, that's a warranty replacement. And if that doesn't work get a replacement device. Something is defective.
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Talking with support now, thanks for the heads up.

I had the same problem this morning. I am on ICS 7.4 stock and I recently added some mods from dark kobalt theme. First my phone died while charging, so I turned it back on and I received a message about too many things running and before I could stop the tasks it turned off again. After a couple tries, I was able to close all background data etc. At this point it still wouldnt take a charge but it would stay on while plugged into charger...15 mins later it started charging normally again!

What "method" do u use to charge your Captivate

Hello !
I have read several articles in where people use different methods to charge theyr battery.Maybe it has been talken in XDA too but i havent found nothing that regards charging
How do u charge the battery ?U keep the level from 90 % to 50 % and once a month u fully discharge and than fully charge ?
Or u fully charge it after it shuts off cause of low battery?
Thanks

I'm a bit of a battery abuser, I tend to charge randomly when I think it will be under heavy load such as long drive in the car listening to music I will plug it in with my cigarette usb adapter thingy..
Most other times just plug it into my laptop. My habit for discharging and turning it on until it dont turn back on is maybe every couple weeks to a month if I remember to. Bout that time is when I start cycling out old apps I don't use and just maintaining clean phone status.

...Wall charger every night, all night, while still on, while I sleep. Been doing it this way for 2 years and still using the original battery.
Sent from my SAMSUNG-SGH-I897 using xda premium

I just charge it whenever it's anywhere between 40-50% and have access to an outlet.

I use USB to charge my phone I plug it in at night around 9 and it's good around 10am then I unhook it. It stays good till about 6 or 7 pm
Sent from my SGH-I897 using xda app-developers app

Lithium Ion batteries don't have memory effect, so the only reason to run a complete drain and recharge is if the battery fuel gage needs calibration.
I leave mine on the AC or USB charger everynight. The Captivate's power management chip reduces the charging current when the battery approaches full. After becoming fully charged, it stops charging for an hour or two, waiting until the voltage has dropped about 0.1 V, then resumes the small trickle charge until full again.
You want to avoid getting the battery too hot, because that will reduce battery life (life= number of battery charge cycles). I have an alarm set in battery monitor widget (bmw) when the battery temp is 45 degrees C or higher. you can get bmw or other battery tools on Google Play.
you can read more about charging Li Ion batteries here:
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
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edit: revise link to batteryuniversity

It is my second time that i fully drain and fully charge my battery.
It is wrong what im doing ?

I don't think of it as right or wrong. You don't need to drain it all the way or charge it to 100% if it is not convenient.
I put my phone on the charger at night even if the battery is 60% or more full, with the phone on. I want it at 100% in the morning. During the day, it often gets charged while I am driving or when I am using my laptop. Is is seldom fully charged during the day, and it rarely gets drained all the way.
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Hamsters...

^
Lol !
And the hard part was that it took ya 2 months to train the one hamster to say, "Beeeep ! Fully charged !"
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4-2ndtwin said:
^
Lol !
And the hard part was that it took ya 2 months to train the one hamster to say, "Beeeep ! Fully charged !"
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Exactly! But we're still having issues with his timing!
Sent from my SGH-I897 using XDA

I just plug it into a wall socket when it drops below 50% ... been doing it that way for a couple of years and haven't had any issues.

on a normal day, my cappy gets to 10% and under and then i charge it everynight

m1batt1 said:
Hamsters...
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Yeah, and you want to give 'em hummingbird food for faster charging and best compatability with the captivate's cpu. With this charging method, you can even hear the hummingbird hum if you put your phone in a conch shell and hold it up to your ear.

I use a potato battery.
Sent from my Galaxy Nexus

MikeyMike01 said:
I use a potato battery.
Sent from my Galaxy Nexus
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Good to see you still popping your head in the cappy forums
I charge my phone whenever the hell I feel like it. No thought to it, always have. Battery still holds a charge perfectly fine.

MikeyMike01 said:
I use a potato battery.
Sent from my Galaxy Nexus
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how many potatoes in series does it take to get 5 Volts?
one potato, two potato,
three potato, four?
five potato, six potato,
seven potato, more?
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laughingT said:
how many potatoes in series does it take to get 5 Volts?
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Click to collapse
42.
Sent from my Galaxy Nexus

I have four batteries for my Captivate, because the original seemed sorta crappy, and I found supposed-OEM batteries pretty cheap on Amazon.
My micro-USB port seems to have taken a crap, and the phone will no longer charge via that method. So basically, I have an extra-battery wall charger going all the time, and I swap batteries whenever the battery in the phone dies.

I just connect the usb cable port from my Xbox to the phone when I'm at the man-cave table. At night to my computer's usb port since it still power's up when the computer's off which is convenient :laugh:

[Q] Charging decharges w/data on

My phone's battery goes down if it's charging and the data is on until the phone dies. I'm using miktouch and Hyperion's extended battery. It also doesn't seem to charge fast at all (12+ hours). Once it's "dead"it will power off, then randomly go back to 100% battery (orange light to green light).
Anyone else have this issue?
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4g data and wifi*

GiftigDegen said:
My phone's battery goes down if it's charging and the data is on until the phone dies. I'm using miktouch and Hyperion's extended battery. It also doesn't seem to charge fast at all (12+ hours). Once it's "dead"it will power off, then randomly go back to 100% battery (orange light to green light).
Anyone else have this issue?
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First guess is you have a defective battery. Draining while connected to the charger should never happen with a good battery.

I guessed as much too. These Hyperion batteries go bad quickly. I've had five since January.
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Fuzi0719 said:
First guess is you have a defective battery. Draining while connected to the charger should never happen with a good battery.
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Have you ever used the Anker batteries?
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GiftigDegen said:
Have you ever used the Anker batteries?
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I've not used them, but everyone I've talked to says they're the best.

Fuzi0719 said:
I've not used them, but everyone I've talked to says they're the best.
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I just got mine. It says to not use more than 4.2V to charge it. My chargers are all 5.0V. What kind of danger am I playing with buy not buying a compatible charger?

GiftigDegen said:
I just got mine. It says to not use more than 4.2V to charge it. My chargers are all 5.0V. What kind of danger am I playing with buy not buying a compatible charger?
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With LiPo batteries there is the danger of explosion/fire. I have an Anker universal charger and note that the output when plugged in is 4.2V. However, USB ports output 5V, so I would think the Anker battery can tolerate that otherwise you would not be able to charge the phone by plugging into a USB port.

Fuzi0719 said:
With LiPo batteries there is the danger of explosion/fire. I have an Anker universal charger and note that the output when plugged in is 4.2V. However, USB ports output 5V, so I would think the Anker battery can tolerate that otherwise you would not be able to charge the phone by plugging into a USB port.
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I hope so too.
So, brand new anker and the battery still decharges when plugged in and goes full charge once the phone is off. I'm thinking there's something broken with the phone and not so much the batteries.
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From a lot of the comments in this forum, I suspect the phone has a charging circuit controlled by software rather than hardware. Before you do anything hardware drastic, you might try flashing a different kernel.
Also, you report that the battery leaps to 'full' when you disconnect the charger. Have you tried measuring the battery voltage physically with a multimeter to see if the battery is charging at all. Should be 4.2V when fully charged. Something like 3.6V when empty. Obviously if you put the battery in for half an hour and the voltage goes up, it's charging no matter what the UI says!

I've not tried either of those. I don't completely understand what the kernel is. I'm using Miktouch rom, but I don't know how much that has to do with the kernel. I know the battery is being charged because if I leave it plugged in for a good 8 hours it holds its charge for the day. And if I leave it plugged in for say, half a day, and turn off data/wifi, it will slowly show increased charge, like a percentage per half hours of charging.
What do I need to know and do to flash a new kernel on here?
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GiftigDegen said:
I've not tried either of those. I don't completely understand what the kernel is. I'm using Miktouch rom, but I don't know how much that has to do with the kernel. I know the battery is being charged because if I leave it plugged in for a good 8 hours it holds its charge for the day. And if I leave it plugged in for say, half a day, and turn off data/wifi, it will slowly show increased charge, like a percentage per half hours of charging.
What do I need to know and do to flash a new kernel on here?
Sent from my MikTouch_4G_Slide using xda app-developers app
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Your the only one of my users to ever have this issue, including me. And the doubleshot was my last device before going Nexus last February.
What I would do is:
1. Backup all your user downloaded apps with Titanium Backup.
2. *Do a full wipe from recovery*
*Wipe data/factory reset
*Format system
*Format Data
*Format cache
3. Flash MikTouch and reboot.
4. Once rebooted don't go cramming apps and settings back into your phone just yet. Make sure its going to charge and drain like its supposed to. If all is well, then start 1 by 1 with your apps, making sure each of them are not causing your issues. If all tests are passed then something in the ROM its self went stupid.
Sounds like hardware though.
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