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!
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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.
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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.
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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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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?
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It's a 3500mAh extended battery.
I put it on the charger and it doesn't charge, the charging light just flashes and battery monitor widget just shows it discharge until it hits zero and then it charges up to 100% really fast (but it doesn't get a good charge, since reading feeds for 30 min took it down to 60%)
Last time I fixed this by bump charging with the phone off and then it lasted for a week or so pretty good.
Well it did it again last night, so I tried bump charging and resetting battery stats. After reboot it fell to 85% pretty fast.
Another odd thing it's done is it will be at like 65% and then after a reboot it will sit at 1% for the rest of the day until the battery dies. Pulling the battery out and putting it back in fixes this.
Is this just a crappy battery or is something up with the phone's charging circuits?
What rom/kernel are you on?
I have the 3500 battery, too, and I'll go from 100% to 90% pretty quickly. Calibrated twice, too. I figure that's just an issue with the nonlinear (or at least different voltage curve trends from 100%-0%) voltage output of the extended battery.
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ACS 1.1.0 don't know if that's related though.
What worries me more is the not charging issue.
Sent from my SPH-D700 using XDA App
Have you tried calibrating it and clearing your batt stats in CWM?
Do you BONSAI?
Tried clearing batt stats a couple times... Now when the phone restarts, it thinks that the % is really low even for the STOCK battery...
Been sitting at 16% for 3 hours with use. (was 55% before reboot)
orb360 said:
Tried clearing batt stats a couple times... Now when the phone restarts, it thinks that the % is really low even for the STOCK battery...
Been sitting at 16% for 3 hours with use. (was 55% before reboot)
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What were the conditions when you cleared the stats? You need to either fully charge the battery on and external charger or when the phone is off. Then boot into CWM and clear the stats.
Do you BONSAI?
Need a few tips to discharge my battery faster after I wipe stats...battery life has sucked since Ive had this phone(still a great phone) just need 2 improve my battery life..any help will b appreciated
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bnoot said:
Need a few tips to discharge my battery faster after I wipe stats...battery life has sucked since Ive had this phone(still a great phone) just need 2 improve my battery life..any help will b appreciated
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You should never fully discharge a Li battery; to recalibrate, wait until your phone is fully 100% (not just until the LED turns green), wipe stats and then unplug and use as normal. It will take a few days for the OS to recalibrate but after a few cycles of dropping it to around 15-20% and bringing it back up to 100%, you should see an improvement.
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OriginalGabriel said:
You should never fully discharge a Li battery; to recalibrate, wait until your phone is fully 100% (not just until the LED turns green), wipe stats and then unplug and use as normal. It will take a few days for the OS to recalibrate but after a few cycles of dropping it to around 15-20% and bringing it back up to 100%, you should see an improvement.
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Exactly right. Be careful, some people will tell you to discharge until the phone powers off. But this is risky, and not necessary. Over-discharge of a Li-ion battery can result in the battery no longer taking a charge, forcing replacement of the battery or recharging using a special battery meter with a "boost" function, which most people do not have access to (often easier just to get a new battery). The batteries have a safety circuit which is designed to prevent over-discharge, but its not 100% reliable. People on here have reported dead batteries on the Vision and other phones (after letting the battery discharge until the phone powered off), probably for this reason. Plus, the battery meter on phones are really not all that accurate to begin with, so discharging fully is not going to be any more accurate than discharging to a safe 15-20%. So zero reason to discharge the battery fully.
Ok...thank both of you 4 your information
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flashed rom on low battery -.- now wont charge and stuck at 10% any solutions ? :silly:
Buy a new battery. Always flash with at least 50%.
AttachedSilver said:
Buy a new battery. Always flash with at least 50%.
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i have an extra battery would i just flash it again with the other battery thats fully charged and calibrate the battery stats??
Thank you
Try wiping battery stats in recovery
Sent from my SGH-T999 using xda app-developers app
Try first wiping battery stats
AttachedSilver said:
Try first wiping battery stats
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i wipe battery stats but still just does not want to charge passed 10% -.- also look at this person video and i dont know if it would help
http://www.youtube.com/watch?v=XVszV5GAL6U
fixed
just let battery drain all they way and recharge to 100% and use battery calibrate on the market to wipe battery stats
Hi
I got a 6200mah extended battery
How do I calibrate the battery without rooting? Is there an app for calibration?
Or must I root in order to get accurate percentage reading for my battery?
Thanks
You don't need to calibrate lithium ion/polymer batteries.
Just whack it in, charge it up and go about your normal day
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The reading on the phone seems a bit off. It flatlines on usage for 2 hours at 3% seems phone not able to take accurate reading of battery true capacity in percentage
If the readings seem off, you can just charge to full and drain battery to about 1% then recharge. That is all calibrating really is. The concept of providing a low and high point
Those root apps that you see that "calibrate" the battery usually only wipe the phones battery stats which is placebo and has no effect on battery life. That file is essentially wiped everytime you charge to full and unplug.
Is this your first charge with it? If so just do a full charge cycle.
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