about an hour ago my battery was displaying around 80% and then after picking it up to send a text, it jumped up to 99 and after about 20 minutes it bumped down to 98 and then later to 97.
Tried a reboot and still popped up as 97. and did a battery pull and still 97. I looked at my battery info and im at 4.016Volts and its showing 97%. i cant remember if this sounds right or not. turned on GPS, bluetooth, and wifi and was able have it drop to 96
I wiped batt stat and shes sitting at 95 now. my hands are up in the air, maybe i found the magic battery
What rom are you on? If I'm not mistaken the photon battery shows battery drops in 10% increments not 1%. Try charging to full with phone plugged in, get battery calibration from market, and calibrate it see if that works.
kennypow3rs said:
What rom are you on? If I'm not mistaken the photon battery shows battery drops in 10% increments not 1%. Try charging to full with phone plugged in, get battery calibration from market, and calibrate it see if that works.
Click to expand...
Click to collapse
runnin cybik's CM7 with Jokers CM7 kernel. i did do stress tests on the CPU yesterday evening and then a battery test, so maybe she got a little confused. ay 95% right now and battery info says 3.874Volts. im thinking 3.8 range should be more in the 70% range not 90.
Edit: now its at 94% but jumped up to 3.967Volts. very odd
lroy said:
runnin cybik's CM7 with Jokers CM7 kernel. i did do stress tests on the CPU yesterday evening and then a battery test, so maybe she got a little confused. At 95% right now and battery info says 3.874Volts. im thinking 3.8 range should be more in the 70% range not 90.
Edit: now its at 94% but jumped up to 3.967Volts. very odd
Click to expand...
Click to collapse
I don't think the cm7 photon rom reads the battery stats correctly. I'd actually disable that if I were you. I'm referring to the percent mod in the battery icon if that's what's bothering you or in cm7 settings. To measure battery stats correctly try downloading "battery monitor widget" (free) from market and it will give you correct temps, volts etc. Then again my theory could be completely wrong about this whole 10% to 1% deal but worth a shot.
kennypow3rs said:
I don't think the cm7 photon rom reads the battery stats correctly. I'd actually disable that if I were you. I'm referring to the percent mod in the battery icon if that's what's bothering you or in cm7 settings. To measure battery stats correctly try downloading "battery monitor widget" (free) from market and it will give you correct temps, volts etc. Then again my theory could be completely wrong about this whole 10% to 1% deal but worth a shot.
Click to expand...
Click to collapse
i have "battery Left" installed and its displaying the same as my CM7 system battery display. I downloaded the app you suggested and its displaying the same % and voltages. good looking app too.
I turned on wifi and streaming pandora to see what a drain would do to it and it seems to be dropping as normal. apparently a giant wireless charger must have rolled over the roof of my office and charged my phone for me lol. im not too worried about it, just never seen anything like this before. time will tell. im gonna let it drain till shutoff and see what happens after a full charger, will take a while to drain this sucker.
I have had the same confusing problems running the same rom and kernel.
Sent from my MB855 using xda premium
Has anybody had luck resetting battery stats with CWM?
Its just an issue with battery stats. Download battery calibration and run it at 100% and see if it still happens
Sent from my Mophukin Photon runnin Skinny1, One.Four OC like a Boss...
Related
Yesterday, I let my battery die. Charged it last night, and wiped battery states. Ran the phone like normal today. Was down to about 30% left, rebooted. When everything came back up and running, that battery showed to be 5%. WTF!!! How do I drop 25%, just by rebooting?!?!?!?
chadhoard said:
Yesterday, I let my battery die. Charged it last night, and wiped battery states. Ran the phone like normal today. Was down to about 30% left, rebooted. When everything came back up and running, that battery showed to be 5%. WTF!!! How do I drop 25%, just by rebooting?!?!?!?
Click to expand...
Click to collapse
Bad battery stats...
Recondition
xriderx66 said:
Bad battery stats...
Recondition
Click to expand...
Click to collapse
So...I should wipe the battery stats again after re-charging to 100%?
Then wipe the battery stats in advanced of recovery mode
xriderx66 said:
Then wipe the battery stats in advanced of recovery mode
Click to expand...
Click to collapse
I re-wiped the battery stat this morning. I was down to about 50% when I needed to reboot. When everything came back up, it showed I was down to 28%. Is this an indication that the battery needs to be replaced or should I try a different Kernel?
Either you have a bad battery, bad battery meter, or your not reconditioning right.
Longcat14 said:
Either you have a bad battery, bad battery meter, or your not reconditioning right.
Click to expand...
Click to collapse
What would you suggest I try? What is the proper way to recondition my battery?
Charge to 100%
Boot into recovery
Wipe battery stats
Reboot
Don't unplug charger until at desktop again (You could debate this one, but that's when I do it)
And don't worry about killing your battery, it'll do more harm than good.
Explanation - When you wipe battery stats, it tells your phone you're at 100%
So, if you wipe when you ARE at 100% you'll get accurate readings.
Eogram said:
Charge to 100%
Boot into recovery
Wipe battery stats
Reboot
Don't unplug charger until at desktop again (You could debate this one, but that's when I do it)
And don't worry about killing your battery, it'll do more harm than good.
Explanation - When you wipe battery stats, it tells your phone you're at 100%
So, if you wipe when you ARE at 100% you'll get accurate readings.
Click to expand...
Click to collapse
The past 2 times I did this, the phone was turned off and plugged in and charged over night. this morning I wiped the stat, but i do not remember if I had unplugged it before it finished booting up. I am charging it now, with it on. When it reaches 100%, should I reboot into recovery and wipe it or should I let it run all the way down?
What exactly do you mean by 'let it run all the way down'?
Sent from my SGH-T959
Eogram said:
What exactly do you mean by 'let it run all the way down'?
Sent from my SGH-T959
Click to expand...
Click to collapse
Down to say some were around 20 - 5%.
As far as I understand that shouldn't be necessary, and could weaken your battery.
As long as it's fully charged when you wipe the stats you should be good to go.
Sent from my SGH-T959
Eogram said:
As far as I understand that shouldn't be necessary, and could weaken your battery.
As long as it's fully charged when you wipe the stats you should be good to go.
Sent from my SGH-T959
Click to expand...
Click to collapse
I have another 20% to go. i will let you know tomorrow how things work out.
Eogram said:
As far as I understand that shouldn't be necessary, and could weaken your battery.
As long as it's fully charged when you wipe the stats you should be good to go.
Sent from my SGH-T959
Click to expand...
Click to collapse
Ok...I have ran the phone like normal. Within 6 hours, I am down to 62%. I rebooted the phone, and it still shows me at 62%. At least I have that fixed.
Now, I see some people use OverStock and seem to be getting better battery life. I just want to get about 16+ hours out of my battery. Right now i seem to be pushing 12 hours. What is the tick that i am missing??
For every hundred vibrant users there seems to be a hundred different accounts of battery life, and a hindered different opinions on how to keep it down. 12 hours on the stock battery is pretty good, especially compared to stock.
Mine'll last me around 15+, if I left it not charging, i think.
I'm on overstock, the screen is at the dimmest 95% of the time, and I use setcpu. 1000/1000 with a screen off profile of 200/200. So, that works for me pretty well.
Sent via telepathy
You need to recondition yr battery as posted above, 2-4 cycles. But i prefer to re-flash ROM when battery 100%, should you get proper batt stats.
You may buy new one to test yr system n batt stats, also good for spare. Or just borrow yr friends battery, just to check yr rom n batt stats. Treat it like you did before.
Good luck.
Eogram said:
For every hundred vibrant users there seems to be a hundred different accounts of battery life, and a hindered different opinions on how to keep it down. 12 hours on the stock battery is pretty good, especially compared to stock.
Mine'll last me around 15+, if I left it not charging, i think.
I'm on overstock, the screen is at the dimmest 95% of the time, and I use setcpu. 1000/1000 with a screen off profile of 200/200. So, that works for me pretty well.
Sent via telepathy
Click to expand...
Click to collapse
200/200 conservative scaling and no sleep death? Didn't know that was possible on overstock...guess I'll try it.
Edit: sleep of death...you must be on power save or something which afaik doesn't work at all.
*checks*
Yeah, powersave. What's this about it not working? It occasionally lags a little when I unlock it and the widget definitely says 200
Sent via telepathy
I don't think powersave is supported...try conservative and you'll get sleep death due to the low frequency...you don't get this with powersave because I don't believe it's working...trying to confirm this.
Not battery life.
Today i noticed my battery meter has been sticking, any way to fix that? It'll drop 20% upon reboot.
Today i noticed that my battery would spike up from 95% to 100% while charging and not go anywhere in between,. Is that normal? Battery calibration app kept going off early, and then as soon as it hit 100% i unplugged it without calibrating it, and it dropped to 99%. Happened twice in five minutes.
Also, instead of using clockwork recovery, i use Battery Calibration app to wipe my batt stats.
What mV should i be on?
One last thing, how do you bump charge? And is it really that unsafe?
Nikolai2.1 said:
Not battery life.
Today i noticed my battery meter has been sticking, any way to fix that? It'll drop 20% upon reboot.
Today i noticed that my battery would spike up from 95% to 100% while charging and not go anywhere in between,. Is that normal? Battery calibration app kept going off early, and then as soon as it hit 100% i unplugged it without calibrating it, and it dropped to 99%. Happened twice in five minutes.
Also, instead of using clockwork recovery, i use Battery Calibration app to wipe my batt stats.
What mV should i be on?
One last thing, how do you bump charge? And is it really that unsafe?
Click to expand...
Click to collapse
I noticed this yesterday, I had my phone plugged in and it was at 94-95% and 2 minutes later it was at 100%.
To bump charge, once your phone is at 100%, unplug your phone power it down then replug it in. Once it shows the green LED meaning 100% charged boot your phone up and keep it plugged in. Might go back to being orange saying its not 100% yet so let it get to 100%. Unplug it and replug it back in a couple times until every time you plug it in it shows green for 100%.
I would think that it would be bad for the battery if you do this every day, but I can't give a definite answer for that. I use Battery Calibration to do that too, but between today and yesterday after I flashed over the new CDMA/LTE radio leak from the Radio thread my battery life hasn't been great. Considering going back to the stock radio.
I've noticed similar things on my bolt and even my dinc. To counteract this, I stopped looking at the battery % and got battery left instead. This app tells you how much longer your battery will last in hours rather than %. I no longer freak out about my battery life, %, or what others are getting; I've never been happier.
Sent from my ThunderBolt using Tapatalk
necosino said:
I've noticed similar things on my bolt and even my dinc. To counteract this, I stopped looking at the battery % and got battery left instead. This app tells you how much longer your battery will last in hours rather than %. I no longer freak out about my battery life, %, or what others are getting; I've never been happier.
Sent from my ThunderBolt using Tapatalk
Click to expand...
Click to collapse
Sounds like a good idea especially for me lol. I noticed this morning that my phone was 56%, down from 74%. 18% drain over the time span of like 6-7 hours or so while I was sleeping. Not sure how good or bad that is, but for me it was just like wow.
You're being anal. Don't worry about it. Your phone is working fine. The battery level will appear to jump around a bit, especially when going on/off charger, or rebooting. Search around if you feel a need to know why.
So I have just flashed the CM7 ICS Themed BETA, wiping everything.
I then charged to 100 percent, and used Battery Calibration app.
I have just setup some apps, and I have lost 10% battery life in 40 minutes
Display is using 85% battery life apparently.
Please help?
It can take up to a week to fully calibrate the battery. Since the battery doesn't have memory the phone has to get a feel for how much juice it actually has. Try it for a few days running the battery down and then charging it to full without unplugging. If that doesn't work you might want to try charging all the way then reflashing and immediately do a calibration.
Sent from my MB860 using xda premium
Yeah, I'd calibrate the battery - wouldn't hurt.
Ideally always flash on a 100 % full battery to avoid problems like yours..
Vangelis13 said:
Ideally always flash on a 100 % full battery to avoid problems like yours..
Click to expand...
Click to collapse
Cheers guys I've taken this all on board.
I'm on 13hrs on battery, its showing 16pc. Battery calibration app shows 3609mv however. This doesn't seem right to me. Am I correct in assuming the phones battery power is the mv listed and no battery is more like 100mv??
Could anyone explain the 'mv' term to me?
Is 0mv when it powers down? Is this indicative of power?
Thanks.
Lithium ion batteries never fully discharge. If they did the battery would not recharge again.
Sent from my MB860 using xda premium
mv referers to mV, as in Milivolt. Most li-ion batteries are rated at 3.7V or 3700mV. A nominal full charge should be around 4.2V or 4200mV.
dLockers said:
So I have just flashed the CM7 ICS Themed BETA, wiping everything.
I then charged to 100 percent, and used Battery Calibration app.
I have just setup some apps, and I have lost 10% battery life in 40 minutes
Display is using 85% battery life apparently.
Please help?
Click to expand...
Click to collapse
That's 35 minutes of active use. 10% isn't outside the realm of the possible.
I usually can go a full day on 60% battery, but this morning Facebook, the interwebs and text messaging put me from 100% to 77% in the course of 30 minutes. Draining 10% in 45 minutes does not seem out of the realm of possibility
I get mine to last around 20-26 hrs on a single charge, of course depending on use. but i hardly leave the house and dont use it a whole lot. One thing to make sure of is setting up profiles on SetCPU and/or undervolting. i just posted my setup on another thread. http://forum.xda-developers.com/showpost.php?p=20284361&postcount=28
so after you clicked the battery calibration button and it said calibration successful, you're wondering why the battery is dropping so fast under use right away?
Easy answer my friend, when you first use the battery calibration app, the first cycle (when phone is being used) will always drain a lot faster than the 2nd and 3rd time around.
The battery calibration app, wipes the battery stats, and makes a new one, however that does take at least 1 - 2 times of a full charge/discharge of the battery. There is a battery tread in the atrix general forum i believe for cailbration steps, etc to go about successfully doing a complete calibration when flashing from rom to rom.
Hope this helped
Hmm, maybe I am just upset that I have to charge every night.
Coming from a BlackBerry 9780 I could go 2 days with semi-heavy use.
I am now using the official Motorola cable, and only charging from very low to full.
Thank you for the advice.
dLockers said:
So I have just flashed the CM7 ICS Themed BETA, wiping everything.
I then charged to 100 percent, and used Battery Calibration app.
I have just setup some apps, and I have lost 10% battery life in 40 minutes
Display is using 85% battery life apparently.
Please help?
Click to expand...
Click to collapse
Try getting one of these:
4800mah extended battery
1900mah extended battery
Problem Solved.
Bluetooth radio was killing my battery. WiFi is fine leaving it on as it disables in stand by, but bluetooth was absolutely draining everything.
thanks for the update
I agree, 10% loss in 40 minutes of active usage is not bad. If the OP had better battery life before he flashed to new ICS themed CM7 beta rom, maybe the new rom is to blame??? I'd OC/UV, possibly with the latest faux123 kernel.
dLockers said:
Problem Solved.
Bluetooth radio was killing my battery. WiFi is fine leaving it on as it disables in stand by, but bluetooth was absolutely draining everything.
Click to expand...
Click to collapse
Thanks for the tip!!!
My htc amaze doesn't display battery % correctly all the time.
How can I calibrate my battery? I see a bunch of methods but Im not sure whats best for the amaze
Im useing bulletproof 2.1.0 and faux .008 beta 4
thanks!
what has worked for me with bulletproof is to drain the battery to under 15%, charge it overnight, boot into recovery and wipe the battery stats.
will try it, thanks
rdmay20 said:
My htc amaze doesn't display battery % correctly all the time.
How can I calibrate my battery? I see a bunch of methods but Im not sure whats best for the amaze
Im useing bulletproof 2.1.0 and faux .008 beta 4
thanks!
Click to expand...
Click to collapse
BTW, there is a new faux kernel out now. Beta 5 released.
Sent from my HTC Amaze 4G using XDA App
so i figured out that my phone doesn't read my battery life correctly anymore, it will be at 39% and shut down, then i turn on my phone it will have 4% and itll turn off right away so i plug in my charger and it'll have 55%
dont really understand whats going on any help?
I just used this app and it worked, it reads the percentage just fine
https://market.android.com/details?id=com.nema.batterycalibration&hl=en
I havent been able to get my battery to stay at 100%, just says 99% and i have to guess when its fully charged. wiped battery stats and everything. running the same ROM
rdmay20 said:
I just used this app and it worked, it reads the percentage just fine
https://market.android.com/details?id=com.nema.batterycalibration&hl=en
Click to expand...
Click to collapse
As the app says, all it does it delete the batterystats file. Use root explorer and go delete /data/system/batterystats.bin and you accomplished the same thing as that "app"
stratax said:
I havent been able to get my battery to stay at 100%, just says 99% and i have to guess when its fully charged. wiped battery stats and everything. running the same ROM
Click to expand...
Click to collapse
I get the same thing.. and because the device doesn't die all the way(at about 1% it does a soft power off) I can't get it calibrated right.
I'm using senseless, and I think it is more than the battery stats file.. tonight it was at 40%, started bootlooping for no apparent reason.. pulled the battery, rebooted and it said it was at 13%.
It has been a solid rom in a lot of senses(pun?), but I may try something else because of the quirks it has been having..
Silentbtdeadly said:
As the app says, all it does it delete the batterystats file. Use root explorer and go delete /data/system/batterystats.bin and you accomplished the same thing as that "app"
I get the same thing.. and because the device doesn't die all the way(at about 1% it does a soft power off) I can't get it calibrated right.
I'm using senseless, and I think it is more than the battery stats file.. tonight it was at 40%, started bootlooping for no apparent reason.. pulled the battery, rebooted and it said it was at 13%.
It has been a solid rom in a lot of senses(pun?), but I may try something else because of the quirks it has been having..
Click to expand...
Click to collapse
thats what was happening to me, i did a full wipe, using bulletproof, then calibrate, Im still testing but so far it reads fine, will update if everything is working fine in a couple of days.
another method is abit troublesome...
1. charge your phone battery till full (off mode)
2.when full unplug it, and open up the cover
3. take off the battery and left it there over 90sec or more..
4. put back the battery n bootup your phone.. it should calibrate..
if your battery is used too long it might your battery problem
eddie2020 said:
another method is abit troublesome...
1. charge your phone battery till full (off mode)
2.when full unplug it, and open up the cover
3. take off the battery and left it there over 90sec or more..
4. put back the battery n bootup your phone.. it should calibrate..
if your battery is used too long it might your battery problem
Click to expand...
Click to collapse
I might try this. My battery indicator stays at 100% for like ten seconds or maybe longer then goes back down to 99%. Makes no sense lol
Sent from my HTC Amaze 4G using xda premium
stratax said:
I might try this. My battery indicator stays at 100% for like ten seconds or maybe longer then goes back down to 99%. Makes no sense lol
Sent from my HTC Amaze 4G using xda premium
Click to expand...
Click to collapse
I'm only a two week owner of the Amaze, but I've found curious differences between the stock battery and the Anker (1900 mAh). First, the stock battery will remain at 100% for a fair length of time before starting to drop (sorry, I haven't quantified it, but it's easily half hour to 45 mins even after making a call or two). However, the Anker battery drops off of 100% pretty quickly, as little as 10 minutes without doing anything. Admittedly, I've cycled the stock battery a few more times than the Anker, and even Anker says it takes 4 to 5 full charge and discharges to reach best performance, but I don't recall the stock being that quick to drop even after the 1st full charge. I haven't used the Anker enough yet to have a feel of whether the Anker will last longer overall, though.
Off topic, but somewhat related - The Anker charger doesn't seem to charge the battery to a full 100% - either the Anker battery or the original. In both cases, as soon as I install the battery from the Anker charger, the Amaze meter indicates just 96%. I even left it plugged in for another hour after the light turned blue, but it didn't help. Not a biggie, just an observation.
BTW, I got this from someone else who had already posted it, but according to a Google Engineer it seems that resetting battery statistics doesn't help. Read about it here: http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer
gregb882 said:
I'm only a two week owner of the Amaze, but I've found curious differences between the stock battery and the Anker (1900 mAh). First, the stock battery will remain at 100% for a fair length of time before starting to drop (sorry, I haven't quantified it, but it's easily half hour to 45 mins even after making a call or two). However, the Anker battery drops off of 100% pretty quickly, as little as 10 minutes without doing anything. Admittedly, I've cycled the stock battery a few more times than the Anker, and even Anker says it takes 4 to 5 full charge and discharges to reach best performance, but I don't recall the stock being that quick to drop even after the 1st full charge. I haven't used the Anker enough yet to have a feel of whether the Anker will last longer overall, though.
Off topic, but somewhat related - The Anker charger doesn't seem to charge the battery to a full 100% - either the Anker battery or the original. In both cases, as soon as I install the battery from the Anker charger, the Amaze meter indicates just 96%. I even left it plugged in for another hour after the light turned blue, but it didn't help. Not a biggie, just an observation.
BTW, I got this from someone else who had already posted it, but according to a Google Engineer it seems that resetting battery statistics doesn't help. Read about it here: http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer
Click to expand...
Click to collapse
exactly lol. my battery will stay at 100% (99% according to bulletproof) for a long time then once it drops it drops fast
I left my phone off while charging, and I'm having good results.. only weird thing is that it slowly flashes on and off the orange light and never shows green while powered *off* and on the charger.. I can't find anything that shows this is normal. Is it supposed to get to a green light when powered off and charging?
Sent from my HTC Amaze 4G using Tapatalk
Silentbtdeadly said:
I left my phone off while charging, and I'm having good results.. only weird thing is that it slowly flashes on and off the orange light and never shows green while powered *off* and on the charger.. I can't find anything that shows this is normal. Is it supposed to get to a green light when powered off and charging?
Sent from my HTC Amaze 4G using Tapatalk
Click to expand...
Click to collapse
I have the exact problem like you
rdmay20 said:
My htc amaze doesn't display battery % correctly all the time.
How can I calibrate my battery? I see a bunch of methods but Im not sure whats best for the amaze
Im useing bulletproof 2.1.0 and faux .008 beta 4
thanks!
Click to expand...
Click to collapse
Hmmm. I would check this out! http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer
I didnt think it improved battery life, My phone just didn't read it correctly which wiping battery stats does fix!
Firstly, I apologize if this is a total annoyingly noobish post, but I've not encountered this issue before.
Currently when charging, my phone hangs at 99% for over an hour before hitting 100% charge. Additionally, when not charging, the phone will hang at 9% charge for longer than expected and rapidly deplete below 9%.
Info that may be pertain to the problem:
When I got my Rezound and the extended battery, the first thing I did was root the phone and flash Amon Ra.
I waited for the battery to fully charge, then I flashed CleanROM Kang Tapped Edition. I finished my general phone setup and app install stuff and had about 15% battery left (it was now about 8am, pulled an all-nighter.)
An hour later, I get a phone call and what amounted to literally 9 straight hours of phone talk time with only that small amount of battery left. I had to be plugged in pretty much the whole time and I think when I had under 10% battery when I finally got off the phone.
I have tried wiping battery stats after hitting full charge in Amon Ra as well as using the battery calibrator app. After I fully charged and cleared stats, I waited for the phone to deplete the battery before fully charging (I try to let it charge uninterrupted).
The issue still seems to behave exactly the same. Is it possible that I messed up the battery some by talking with low charge and plugged in for 9 hours?
Thanks in advance for any info or advice.
Try reflashing your ROM. I had the same issue with my phone. Assuming your rooted, try zep's battery calibrater script.
Sent from my VS910 4G using xda premium
keynith said:
Try reflashing your ROM. I had the same issue with my phone. Assuming your rooted, try zep's battery calibrater script.
Sent from my VS910 4G using xda premium
Click to expand...
Click to collapse
I am rooted. Looking inside the Die Hard Battery Calibrator script seems to just clear battery stats, which, I believe, happens when the phone is fully charged anyways.
I have been trying the app "Battery Calibration", which also clears battery stats.
There is also the option to wipe battery stats from Scott's tweaks, as well as Amon Ra.
I guess after all the conflicting viewpoints I've heard regarding battery stats, I'm about as confused as ever. I thought that battery stats merely stores data about the power usage, and doesn't actually affect how the OS reads the battery percentage. It boggles me that the OS wouldn't just know the battery voltage, and therefore the remaining charge. Unless batteries have varying voltage (like the Rez 3.7V battery vs the 3.8V battery), this should be more accurate than whatever the hell it is doing.
I'll give the script a shot, I'm just perplexed.
Anybody know of a widget that shows just the mV? Then I can forget about these darn percentages.
*EDIT* Battery Monitor Widget can do mV, among other things.
I wonder if I should try the HTC method contained in the link below:
http://forum.xda-developers.com/showthread.php?t=712990
Here is some word on battery stats from a Google employee:
https://plus.google.com/105051985738280261832/posts/FV3LVtdVxPT