Develop Bugs

(Q) how do you calibrate the G2 battery?

Hey what's up. I got this G2 with the latest cm7, which is build number 21 and the battery life is horrible. Like 8 hours with an hour of the display being on. I'm coming from the Epic which had pretty good battery life once calibrated.
So what's the proper way of calibrating the G2? I am using the stock kernel that comes with the Cm7 rom right now but I did try the pershoot kernel couple times and underclocked it but it still didn't help. I think all that kernel flashing messed up my battery life. So any ideas? Thanks!
Sent from my HTC Vision using Tapatalk

saywhat4118 said:
Hey what's up. I got this G2 with the latest cm7, which is build number 21 and the battery life is horrible. Like 8 hours with an hour of the display being on. I'm coming from the Epic which had pretty good battery life once calibrated.
So what's the proper way of calibrating the G2? I am using the stock kernel that comes with the Cm7 rom right now but I did try the pershoot kernel couple times and underclocked it but it still didn't help. I think all that kernel flashing messed up my battery life. So any ideas? Thanks!
Sent from my HTC Vision using Tapatalk
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Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App

OriginalGabriel said:
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
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Thanks for the tip. Now I have been doing some reading and saw some people recommended charging the phone while it is on when it is fully discharged the first time. You recommend while its off? Does it make a huge difference?

saywhat4118 said:
Thanks for the tip. Now I have been doing some reading and saw some people recommended charging the phone while it is on when it is fully discharged the first time. You recommend while its off? Does it make a huge difference?
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I don't think it would make that big of a difference; if you think about it though, you're dealing with the battery and battery only if the system is turned off.
Sent from my T-Mobile G2 using XDA App

True we are dealing with the battery but when we wipe the battery stats I think it only wipes the battery information the phone had in its system. So if we wiped the stats when it is full then let it discharge till completely empty, im assuming, you would have to charge it while its on so the phone can now learn what the battery level is and when its full and its capacity. I'm just guessing I could be wrong though. I'm just going to try both and see what happens.
Sent from my HTC Vision using Tapatalk

OriginalGabriel said:
Charge your phone all the way to 100% (not just until the LED turns green, which is around 90%), unplug and boot into recovery, wipe battery stats, boot back into Android and use your phone until the battery drains and your phone shuts off. Keep trying to power up until it won't any more.
Now, plug your phone in (into the wall, not a computer) and charge until full *without* turning it on. Remember, the LED turns green around 90% so you'll need to leave it another few hours after the LED changes. Once you're full, unplug and boot into Android and again use it until the battery is fully drained and you can't power up anymore and you're good to go.
Remember, after wiping stats, during the draining process *do not* plug it in to the charger or your computer as thiss will mess up the calibration.
Its a pain, and takes a day or so, but its worth it. To speed up the draining process, do some process intensive things (video watching, game playing, etc.)
Sent from my T-Mobile G2 using XDA App
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Click to collapse
I have used this method to calibrate the battery and can say that it does have a pretty big impact on battery life. +/- 20% in my case. I also find that I need to re-calibrate roughly once every month or so.

To be clear, there is not such thing as "calibrating the battery", you are calibrating the battery meter (volt meter) on the phone. Maybe its just a semantic distinction, and that is what the OP and subsequent replies are talking about. But many people get this confused, due to the old process of "conditioning" NiCad batteries, which is not applicable to modern cell phone (Li ion) batteries.
In my understanging, you aren't going to increase battery life by doing any of the above, but only making the battery meter more correctly read how much power is left. For instance, if the meter is not properly calibrated, it may read lower than it should. So people think they are increasing their battery life.
I would discourage from discharging the battery to empty. Over discharge of Li ion batteries can possibly (not often, but in a small percentage of cases) prevent the battery from taking a charge. There is a safety circuit which is supposed to prevent over discharge, but it does not always work. Therefore, Li ion batteries should not be discharged lower then 20% whenever possible. Most of us do it from time to time on accident, but there is not reason to do it intentionally. Charge the battery to 100%, drain to 20%, and repeat a couple times. This will get your battery meter plenty accurate. Draining it to empty does not really gain you anything (the battery meter is not that accurate in the best of circumstances, anyway), and can harm the battery.
http://batteryuniversity.com/learn/article/do_and_dont_battery_table
Flashing a new ROM resets the battery meter. So until its properly calibrated, it will give you junk readings. This is one reason why people often jump the gun and think that a custom ROM is getting them poor battery life. Calibrate the meter, and use the ROM for a couple days, then you should get a real indication of what the battery life is like on that ROM.

redpoint73 said:
I would discourage from discharging the battery to empty. Over discharge of Li ion batteries can possibly (not often, but in a small percentage of cases) prevent the battery from taking a charge. There is a safety circuit which is supposed to prevent over discharge, but it does not always work. Therefore, Li ion batteries should not be discharged lower then 20% whenever possible. Most of us do it from time to time on accident, but there is not reason to do it intentionally. Charge the battery to 100%, drain to 20%, and repeat a couple times. This will get your battery meter plenty accurate. Draining it to empty does not really gain you anything (the battery meter is not that accurate in the best of circumstances, anyway), and can harm the battery.
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I was about to post this. Letting a LiIon discharge all the way is more harmful to the battery than recharging it mid drain cycle.

I'm having a bit of battery issues, I haven't flashed a ROM or calibrated my battery meter. So I charge my phone to full while still on, unplug it and drain it until it turns off (NOT until the battery is completely drained, which could potentially damage the battery), plug it up and let it charge while off, and I should be calibrated?

Do you need to have root to be able to reset battery stats?
Sent from my T-Mobile G2 using XDA App

Bought extended battery today how to set up phone?

I was wondering how i would set up my phone. Reset batt stats, longer charge times or something on how to get the best out of the extended 3500 battery. Also any hints or advice?

i have the same one and i just cleared the stats after charging the battery till full.

Sorry bad post delete please. This message just this one lol.

How do I know its full. ? Just over charge it with it on or off?. That's what u wanted to know. And does the percentage become accurate after doing this?. As I understand right now it should only register at 1500 right until the batvstats are chnage and then registers as 3500. And should display % based on that
Sent from my PC36100 using XDA App

i let mine charge until the green light was on, then unplugged and waited for the light to go out and re plugged did that a couple times until light is orange and charged till it was green again. havent had any problems.(knock on wood)

Do you know how long it took for that process? im getting it green now and will do the rest tonight with it being off. I am hoping that it registers the full battery capacity.

I've had very good luck with a $7 Chinese 3500mah from Amazon. I reset my stats through my battery widget but not until weeks after I had the battery. I don't think I was rooted when I first bought it.
The first day I got it I installed it and it showed 66%. I ran it down to 0% which took a pretty long time. Supposedly that's important, several cycles of complete discharge.
I have this docking station that is absolutely worthless as a docking station, but pretty awesome as an external battery charger. I use that to charge it, and sometimes charge it while its in the phone with the stock wall charger. The phone recognizes the %'s pretty close. At first it would drop to 80ish% pretty fast and then be really long between 50-80. Now it seems pretty steady all the way through.

Hmm I never thought to run down a Li-Ion battery due to it not actually having a memory.. Well i got it fully charged and I will see how long it takes to run down.
So I am waiting on how things will go for it lol. Thanks for the help guys. If anyone else has anything else feel free to chip in.

Get the battery monitor widget int he market, go into the settings and make sure you set it for the maH that your battery is, and then try the guide in my signature.

I have had my extended battery for some time now. I don't have BMW and have no history out my battery on my phone. All I did was put the extended battery in, played with the phone like crazy, killed the battery all the way, kept the phone off and charged it until 1 hour after the LED turned green. No issues.
Sent from my PC36100 using XDA App

hxxp://i.imgur.com/uZEc4.png
I'm in the middle of a record setting run right now. This is very unusual. Usually I get 16-24 hours. My battery and EVO seem to have a mind of their own. But when it works it works good. I still struggle with intermittent 'android system' battery problems.

[Q] Why is my battery losing life, or not displaying correct percentage?

About a month ago, I flashed Gingerbread onto my Epic 4G. Did nothing else, been running the usual BatteryLife by CurveFish without any hiccups or fluctuating readings.
However, recently, I don't seem to be getting a full charge. Or, the battery likes to drain. Either that or BatteryLife is not giving proper readouts anymore. For example, I can plug my phone in and let it charge. Its LED will go blue and the widget shows 100%. But, now, sometimes I'll look at the phone again later (while it's still connected with the charging cord or not) and the widget will read something like 82%. And, just now the widget is now showing 78%.
My battery has been fully discharged and recharged many times before for proper calibration. I even ran a battery calibration app. Still, this problem happens. What exactly is going on? I have had the phone tethered to remain charged and never once had a problem with the battery. I do know when I flashed Gingerbread, my battery life has increased dramatically.

Charge till you get the fully charge notification
Then turn off
Then go into click work recovery
Go to advanced
Click reset battery stats or something like that
Put back on charger
This proly happens cause of overheats from the super crap **** gb leaks
Also discharging the battery doesn't help
Sent from my SPH-D700 using XDA Premium App

Then, why does everyone say to get the most out of your battery, you discharge it fully then charge it up to 100% about a couple times to maintain proper battery life and calibration?

There is an issue with some installations of the gb leaks where the battery stops charging at 100% even when it is still plugged in. I had this issue and could not remedy it. Went back to a solid ec05 base and my charging works fine again.

a100 can't charge

After a long time no use, I took my a100 out and charge it, the red led at the power button lighted up but it never turn blue even 10 hours later. I powered it on and noticed the battery level was always 0%, everything else is ok though. If i unplug the charger, my tablet turn off immediately. Then I disassemble it, take the battery out and charger it directly about 10 minutes, then i assemble and turn my tablet on, the battery now is 35% but the problem still the same, it can't be charged, the red led still light though. Is there any body know what the problem is and how to fix it, help me please. thanks in advance.
Sorry for my bad english

Not an answer to you Q but I have to say It's always nice not having a removable battery ......can't we just get a battery door and some AA duracells for old times sake
Sent from my HTC EVO 3D X515m using xda app-developers app

Letting a battery fully discharge is about the worst thing you can do, mostly due to the fact that if the battery voltage drops to low it shuts down to prevent cell damage. Basically the battery is telling the Acer it can't be charged because its damaged.
Short answer - new battery time. If you know someone else with one swap and test.
Tapatalked from my Galaxy S II - CM10

[Q] Do extended battery case RUIN the battery ????

Ok so I have one of those extended battery clips. It's not the big battery with the larger door -- it's the one that you slip onto the phone like a battery case.
So once you turn it on, the phone gets INSANELY hot, and it recharges the phone like super fast --- you can go from 50% to 100% in like 15 mins.
My friend said that this isn't good for the battery.
Today I unplugged my phone when I woke up -- it was at 100%
An HOUR later it was at 79% (21% drop) and I honestly didn't even use it once, turned the screen on twice to see the time, and that was it.
So wtf is going on ? Is my battery ruined ? It loses charge insanely fast and what's worse, even when it's plugged in, it takes forever to charge, like very very slow (5% an hour or so)
Please help

I'm not sure what's causing your battery drain. Have you checked if there is a wakelock issue or lack of mobile reception? Try using BetterBatteryStats to determine what's causing your battery drain.
As for the quick charging, it is recommended to only use oem chargers because they provide the correct amount of amperage. You can damage your battery with such a fast charger, however I'm not sure if it will ruin it after only a few charges.
Sent from my SAMSUNG-SGH-I747

Domoo said:
I'm not sure what's causing your battery drain. Have you checked if there is a wakelock issue or lack of mobile reception? Try using BetterBatteryStats to determine what's causing your battery drain.
As for the quick charging, it is recommended to only use oem chargers because they provide the correct amount of amperage. You can damage your battery with such a fast charger, however I'm not sure if it will ruin it after only a few charges.
Sent from my SAMSUNG-SGH-I747
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I have 2 awesome apps for battery. Better battery stats doesn't say anything is draining it, just the screen, which is always the most.
One app I have turns off the 2nd core. The other puts the phone into DEEP SLEEP mode every single time the screen is off, and still none of these do anything ... 20% drain an hour when not even using it ? surely this is an issue with the battery itself and not the phone/software ?

i wish someone could help

absolutely not a single app running -- juice defender working, other apps to turn off everything, all data, wifi, mobile, 3g, etc .
EVERY SINGLE THING IS OFF.
Phone is still insanely hot. Phone is still losing battery (1% every 10 mins) while plugged in.
WHILE PLUGGED IN
please help

Funkadelick said:
absolutely not a single app running -- juice defender working, other apps to turn off everything, all data, wifi, mobile, 3g, etc .
EVERY SINGLE THING IS OFF.
Phone is still insanely hot. Phone is still losing battery (1% every 10 mins) while plugged in.
WHILE PLUGGED IN
please help
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Click to collapse
Hot is not good if everything is off. And in regards to the charging so quickly, this is bad for any lithium ion battery. Stop using the battery case!
See if you can get another stock battery (should be able to from the store it was purchased from or some corporate store for your carrier) and try it without the battery case. If it doesn't work then warranty the phone. If you are not original stock ROM then ensure that you put it back to stock first. Before you go back to stock unrooted make sure your flash counter reads 0 flash counts. Use triangle away if needed.
What brand battery case did you use? I would call and complain to the maker and request my money back.