There you have it, in the title. Google engineer Dianne Hackborn, who has previously explained Android’s hardware acceleration, took to Google+ again to clarify some myths about the Android operating system. This time, it’s a point of common advice that you’ll see in virtually every FAQ thread about custom ROMs and flashing: wiping battery stats in order to improve battery life.
The reasoning behind that piece of advice was something like this: If you, at some point, did not charge your Android device fully (for example, only to 80%), it would supposedly remember that battery level as “fully charged” – in this case, you’d only ever get to use 80% of your battery, which is of course less than optimal. So, if you wipe the battery stats, usually done in ClockWord Mod Recovery, the device would “forget” the previous level, here 80%, and instead charge to the full 100% once again, thereby re-calibrating the battery. Or, as Hackborn puts it in more technical terms:
"The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory."
However, as she explains, that’s not the case. Because those battery stats, stored in the batterystats.bin file, are only used to maintain information about what is using the battery when not recharging. That is, it essentially holds the information displayed in the Settings > Battery screen. Nothing more, nothing less. Thus:
It has no impact on the current battery level shown to you.
It has no impact on your battery life.
What’s more, you’ve probably noticed that the battery usage data is reset once you recharge your device anyway. From this you can correctly deduce that the battery stats are wiped as well – every time your device is recharged. More or less every day. If there was any effect, you would’ve noticed it without going into recovery and doing that stuff. Typical placebo, eh?
Original Article here:
[MYTH] Wiping batt stats helps save battery life
Just because it makes sense, and comes from someone who should know, do you think we are going to believe it? =P
Just kidding. Thanks again!
Interesting, so why is it when I flash something and let's say my bat is @ 20% but after rebooting I'm down to 4%
Doesn't do that all the time but it is odd.
Sent from my VS910 4G using Tapatalk
I saw that behavior on my previous Revo. Sounds like a good question to ask her.
I stopped "calibrating" the battery since that previous phone and have had no problems. Reading mtm say that he never calibrates with all he does with his phone, I am on that boat. Reading the quotes above is reassuring.
Sent from my VS910 4G using Tapatalk
KaneOfMars said:
Interesting, so why is it when I flash something and let's say my bat is @ 20% but after rebooting I'm down to 4%
Doesn't do that all the time but it is odd.
Sent from my VS910 4G using Tapatalk
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I've had this too not sure what it is.
I had that same problem Kane. More than once
I've been Supercharged and Gingervolted!
RootedUser said:
I had that same problem Kane. More than once
I've been Supercharged and Gingervolted!
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I have too and that's the whole reason I calibrate is because I thought it would give me more accurate readings. Plus, maybe I'm losing it, but I always feel like I get better battery life in the middle of the calibration process.
But after reading this, maybe I am crazy lol
Sent from my VS910 4G using XDA App
I calibrated aswell but, it still did same ****
I've been Supercharged and Gingervolted!
RootedUser said:
I calibrated aswell but, it still did same ****
I've been Supercharged and Gingervolted!
Click to expand...
Click to collapse
yea I have heard that calibrating doesn't do anything but never had legit confirmation till now
KaneOfMars said:
Interesting, so why is it when I flash something and let's say my bat is @ 20% but after rebooting I'm down to 4%
Doesn't do that all the time but it is odd.
Sent from my VS910 4G using Tapatalk
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It's a volts/amps thing. The lower your battery is, the faster it will drain. Rebooting your phone takes a lot more energy for all the necessary operations during a boot up. Without going into detail, the amperage will pull voltage down faster on a curve as the battery level gets lower, just as it does when charging.
When charging, batteries will not only appear to charge faster for the first 40-50%, but they are because the charge voltage is much higher than the battery voltage, giving more force of energy movement. As the battery voltage increases, that force is less, therefore taking longer to push amps into the battery.
The reverse is in effect on draining. I would safely say that you likely wouldn't see that much of a percentage of change for a reboot when your battery was fully, or near full charged.
Hope that helps... I also see a major percentage drop when rebooting my phone with a battery at less than 40% charge left in it. If the battery is mostly charged, I don't notice much more than a percent or two drop.
If this isn't helpful enough and need a better explanation, just let me know and I will try to explain it better. It's just basic electricity 101.
-Cybie
@ cybie
Thanks for that bit of info, your explanation was very clear
Sent from my VS910 4G using Tapatalk
the battery drop seems to happen quite often when you flash a ROM mostly I have a question might sound dumb but since the phone is on and all systems are being active wouldnt that use more of your battery life
Damn you Hicks... next you are going to tell me unicorns aren't real.
Yesterday I was at 25% I reboot, and it warned me that I was at 15% upon starting up. I don't think it has anything to do with anything. The phone ran as though the life was still at 25% (an hour or so with heavy-ish usage.) If I have done a lot of rom-ing and theme-ing I will recalibrate (just as a reassurance to myself) I am sure it makes no difference, but it puts me at ease, and really being self centered... isn't that what life is all about?
Poor communication between the battery stat program, and the display program, could this be the thing that is driving everyone nuts? Maybe the two programs need a class to express their feelings better.
markapowell said:
Damn you Hicks... next you are going to tell me unicorns aren't real.
Yesterday I was at 25% I reboot, and it warned me that I was at 15% upon starting up. I don't think it has anything to do with anything. The phone ran as though the life was still at 25% (an hour or so with heavy-ish usage.) If I have done a lot of rom-ing and theme-ing I will recalibrate (just as a reassurance to myself) I am sure it makes no difference, but it puts me at ease, and really being self centered... isn't that what life is all about?
Poor communication between the battery stat program, and the display program, could this be the thing that is driving everyone nuts? Maybe the two programs need a class to express their feelings better.
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Click to collapse
Lol sorry! I'm really not trying to be all "doom and gloom." Just thought it was an interesting find lol.
An Observation
Back in the day I had an Incredible. It was truly an incredible phone. With the exception of the battery of course. There were/are always two camps or schools of thoughts about the battery. One was that you have to "condition" your battery to get better life, the other was "F it, the battery is fine". There was also the "bump charge" mythos going around as well. I think, and this is just my opinion, this is the same thing as the wiping of battery stats every time you flash a ROM.
My experience, both on the Incredible, the Inc II, the Charge, Revo and Bionic, (some of these are my wife's phones) is that conditioning the battery, or wiping battery stats are just really, as Spc pointed out, a myth. Our batteries die faster when we flash a new ROM cuz we are playing with it more. We have a new toy again.. same with themes...or new kernels.
Every time I wipe my battery stats I end up with much worse battery life for several days.
But thank you Hicks for posting the article. Its always good to read a debunked myth!! Bravo!!
These opinions are mine and not intended to troll, or irritate or annoy people. If I do, sorry.
Not sure if anyone else has seen this....but i've found charging a little while longer after it says 100% seems to provide battery life.
If it take it off the charger right away...i get about 8-10hours. If i keep it on a few hours longer, i seem to get about 12.
I'm running at 1.2GHz...gVolt
Related
Battery kept saying 100, but as soon as it was unplugged instantly went to 99.
So i used odin and did the whole nine and charged phone while on had to charge three times back to back and and then it stayed at 100 even after unplugged give it a try..... Hope it works for y'all too!
Where you running a 2.2.1 rom? That battery reating us a known issue
Long way to go for 1%.
Miami_Son said:
Long way to go for 1%.
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lol, some has to have it perfect. ...and yes I'm guilty of that too
Well, if you consider the percentage as being a visual respresentation of the battery's voltage along with a bit of math, then as soon as you remove the charge power, the voltage drops.
It's really nothing like the fuel gauge in your car. Don't get too fixated on it because it's not a very accurate representation of "how charged" the battery is especially at the top, but the 100 is so much better than the stock 10 or so icons... which was more out of sight out of mind.
Yeah I was on 2.2.1. So that drains the batt a little quicker?
Sorry to sound stupid. Still new to all this.
Sent from my SAMSUNG-SGH-I897 (Paragon RC3) using XDA App
In 2.2.1 there's an issue discussed in the Perception thread where the system apps sync constantly.
Go to Settings->Applications->Samsung Apps and turn it OFF.
An interesting read for you may be the http://forum.xda-developers.com/showthread.php?t=806211&highlight=battery+drain thread. I found this useful when I discovered the issue myself.
In 2.2.1, it's a known issue that battery will jump from 100%->98% almost immediately after being unplugged. According to the kernel gods, and if I understand correctly, it's entirely cosmetic, and is just a change in Samsung's reporting functions. So long as it doesn't continue dropping at that rate, I think you're fine.
Thanks for the info.
Sent from my Captivate running Paragon RC3. Using XDA app.
I now have one week to the Nexus One bought secondhand. It suits me perfectly stand alone I have a little trouble with the battery life of the phone. Morning when the phone is 100% and I come out of school (14:30 hours) the battery is still around 20%. I find this a bit short. Ok, I'll use him at school (bit Internet, twitter refreshes every 9 minutes)
There is an automatic task killer, and that helps a bit but I think there are about 80% after 8 hours battery life is a bit much. Me internet is also constantly and I really like to keep.
The battery is probably not because I've got 2 batteries and they both give the same result.
Anyone have any idea what I can do?
I've been a bit inet searched but not really found anything. I did see somewhere a separate battery behind the phone, but I'm not waiting because that makes him a bit heavier and uglier.
10% per hour is pretty poor battery life. Are you running stock Android? 3rd party firmwares can give you much better battery life (the latest versions of CyanogenMod are using less than 1% per hour when fully idle).
But there are things you can check. Have you looked in Settings -> About phone -> Battery usage? If you are using Gingerbread and you look at the graph, if there is a solid line (or mostly solid) next to the "awake" portion, it means that your phone isn't properly entering its low powered state. Download spare parts from the market and check out partial wake usage under the battery history section of that app.
Please post your screen on time value from the battery menu so we can see how long your screen is on.
I would say to go and disable background data. Disabling this will definitely improve your battery life. Of course, you aren't going to get you twitter updates but aside from that, the battery life should improve.
Sent from my Nexus One using XDA Premium App
FLAC Vest said:
I would say to go and disable background data. Disabling this will definitely improve your battery life. Of course, you aren't going to get you twitter updates but aside from that, the battery life should improve.
Sent from my Nexus One using XDA Premium App
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While it is true that battery life would improve if Background Data was disabled (or limited via a program like Juice Defender), it doesn't take into account his actual problem. Unless it is a ton of apps constantly downloading that is keeping his battery usage in the toilet, this will only yield a slight improvement. I believe the cause is is an app (or apps) that prevent his phone from entering the low powered sleep state.
I don't know what stock Android gets from completely idle use (haven't run it since July last year), but a basic CyanogenMod install would sip between 1-2% per hour with the latest stable and the latest nightlies, some are reporting 1% every 2-3 hours when the phone is left alone (due to a fix that lets the microphones go into a deep sleep state).
Twitter refreshing every 9 minutes can not be helping, that said I doubt that's your entire issue but reducing the refresh rate should help quite a bit.
If you bought it used, it could be a bum battery. Not sure i know what apps work best to find out that info. Anybody?
Estimated Prophet Hawk said:
If you bought it used, it could be a bum battery. Not sure i know what apps work best to find out that info. Anybody?
Click to expand...
Click to collapse
The battery app in my sig is the only one that reads the chip inside your battery to tell if it's legit or not, what the battery age is, etc. Needs root to work though.
Estimated Prophet Hawk said:
If you bought it used, it could be a bum battery. Not sure i know what apps work best to find out that info. Anybody?
Click to expand...
Click to collapse
You can also get Battery Left from the Marketplace and when it gets calibrated it gives you a time until death number and some other features.
Sent from my Nexus One using XDA Premium App
Start by getting rid of the task killer.
Sent from my Nexus One using XDA App
There's not a single thread out there that has helped me with my damn battery life that I've been able to find. I'm sick of hearing, "did you search first?" Yes, I searched first. I didn't find anything that helped, that's why I made a new thread.
Anyways, I've tried apps, widgets, calibrating, deleting batterystats.bin, flashing different roms, kernels, modems, and even a new battery. Not a single thing has made my phone last through the day, and it's getting to the point where I'm about to flash back to stock, and forget about it. I need to be able to use it when I need it, not put it back in my pocket because I'm afraid of draining the battery. Honestly I'm not sure if the battery issue is rom related, so If that doesn't work, I may just get a different phone. I need to not have to charge my phone every 6 hours. Does anyone have any idea how to improve battery life on this freakin' thing? 6-7 hours on light usage is not enough. To put it in to perspective, I get 10-15% battery drain in STANDBY per hour. Serendipity 6.4 was a little better than 7, but not much. still within that 6-7 hour range. Is there anything else I can try? Anything at all? I went from 7 back to 6.4 because I thought Android System was draining my battery, but it didn't really do anything. I'm open to everything at this point. Voodoo, cult magic, anything.
Edit: reading through my message, I wanted to clarify that I am very grateful for your help, I hope I didn't imply otherwise.
Serendipity 6.4
Baseband version I9000UGJK4
Kernel Version 2.6.32.9
[email protected]#32 Tue Apr 12 11:43:22 SGT 2011
Need more info? I'd be happy to oblige. Thank you for your help. I know it gets annoying reading posts about this stuff but I really couldn't find anything helpful.
are you using exchange push?
Pirateghost said:
are you using exchange push?
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Disclaimer: I'm a noob.
I don't know what that is heh
Have you tried Juicedefender? It's helped me immensely. Other than that, I could suggest getting an extended battery, if you're willing to cope with a lumpy cappy. I'm too noob to know how to fix this problem other than by using the brute force route, but it's worth a shot.
iamtheculprit2 said:
Disclaimer: I'm a noob.
I don't know what that is heh
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sounds like you have an app that is chewing through your battery.
Pirateghost said:
sounds like you have an app that is chewing through your battery.
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Yeah, with gingerbread roms I've heard it's fairly common for you to have high usage from android system. Check that?
Pirateghost said:
sounds like you have an app that is chewing through your battery.
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Click to collapse
Well, battery usage shows just about nothing... I was using 6.4 but after it did nothing for my battery life, I went back to 7. Now the android system thing is back but I'm getting the same battery life.
Here's what it shows under battery usage for today:
Display 29%
Android System 25%
Android OS 10%
Google Services 7%
Cell Standby 6%
Fancy Widget 4%
Handcent SMS 3%
Battery Graph 2%
Phone Idle 2%
JuiceDefender 2%
Dialer 1%
and that's it.
if you start seeing android system and android os that high, shut down, yank battery and let it sit for a few minutes. then replace and start up. should help with that and improve battery life.
studacris said:
if you start seeing android system and android os that high, shut down, yank battery and let it sit for a few minutes. then replace and start up. should help with that and improve battery life.
Click to expand...
Click to collapse
The problem is, I'd be doing that every 15 minutes. It boots up already taking up more than 10%. I just did exactly what you said, and it booted at 23% for system and 3% for os.
Get,cpuspy and check if it is going into deep sleep
Sent from my GT-I9000 using XDA App
keitaroguy said:
Get,cpuspy and check if it is going into deep sleep
Sent from my GT-I9000 using XDA App
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wilco, will post results soon
keitaroguy said:
Get,cpuspy and check if it is going into deep sleep
Sent from my GT-I9000 using XDA App
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It's reporting roughly 38% deep sleep. 21% in 1000mhz, 3% for 800, 2% for 400, 2% for 200, and 32% for 100.
those seem pretty normal. let me try to pick my brain some more and see what i can think up ill get back to you
keitaroguy said:
those seem pretty normal. let me try to pick my brain some more and see what i can think up ill get back to you
Click to expand...
Click to collapse
flashed cyanogenmod 7, and turned off mobile data and wifi and just left it on idle for like 2 hours after resetting the batterystats.bin and rebooting... i uninstalled juicedefender because it was actually USING batter... *shrug* and left it that way... well, I opened battery left and looked at it and saw that it would die at like 5am... well, i was disappointed... until I noticed it was 5am, 26 hours from now. That's notibly longer than any battery left stat I've seen since I started noting battery issues... So... Yeah. I think I'll stick with CM7 for a while hehe. After I get an idle benchmark, I'll start using it more. Thank you for your help.
do you live in a poor 3g area?
the problem could be that the phone is constantly looking for a good connection and cant find one, causing massive battery drain
Pirateghost said:
do you live in a poor 3g area?
the problem could be that the phone is constantly looking for a good connection and cant find one, causing massive battery drain
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Click to collapse
I was just going to say the same thing. If your phone is constantly trying to establish a connection, is alway searching, it's using up lots of juice. Same if you've got gps enable or wifi on. If it's looking, it's active and battery's being used.
Another thing you can try which helped me is to call art and get another free battery if your phone is still under warranty. The new battery I have seems to last almost twice as long as my old one. Of course make sure that the android os isn't eating the battery and mine last a while. Just a suggestion.
Sent from my GT-I9000 using XDA App
So....long time lurker here....I've tried every rom for the revo, every config setting, every tweak, every update, and so far for speed, battery life etc when running Blitz....the best I can come up with is this:
wipe data/ factory reset in CWM
fresh install:
Gingervolt 1.3
Blitz 2.1
Rom Toolbox Pro.
Toolbox CPU settings: max=1900 min=245 governor=SMOOTHASS
Thats it.
If I go and install scripts....other tweaks....different configurations...they ALL drain the battery faster than that simple setup.
I have the extended battery and I am getting a nice slow drain with decent usage. Blazing fast speed too.
Sometimes LESS IS MORE....and with this phone...after 50 wipes and re-flashes....In my opinion, you will get the best battery life from that config.
I will update this thread with drain % over time...right now I will charge the phone 100% and take it from there.
So...after charging the phone to100%....waited until 3:55pm..then rebooted while plugged in phone untouched until 4:00 pm. I then unplugged the phone and checked battery life exactly at 5:00 ....6:00....and7:00. With ZERO phone use.....the phone....screen off in 4g mode will use exactly 3% every hour on the hour. This is with the settings in the first post.
Thank you very much. Really appreciate it. This works for me too. The Revo has now become very stable, fast, descent battery life. I did it by keeping stock, applying your changes and using Zeam Launcher. Not on Gingervolt.
I have been using the scripts for a week now, and I think I agree. I am sure it's my phone being argumentative. I am thinking of downgrading the supercharger back to the gingervolt, because I think that was the most optimal for my phone, and apparently Mike's too.
Thanks for your post.
next test was to fully charge the phone to 100% ...disable 4g....reboot....wait until 9:00pm andunplug. Again with zero phone usage I waited until 10:00pm. The phone only drained the battery 1%. It went from 100% to 99% in one hour in 3g mode with wifi disabled.
so the next test will be 3g mode with wifi enabled and no use.
after that I will try the phone with wifi enabled in 4g mode
i hope we can zero in on maximizing battery life once and for all.
so one thing i must say regardless of the standby tests.....is that i fully expect garbage battery life after overclocking this phone while i am actually using it. overclocking creates heat......and heat is wasted electricity. so its give and take....sure overclocking is great and the phone isblazin fast...but the battery pays the price.
so theres one thing that is a fact of this phone.....it is 100% impossible to overclock the revolution and get better battery life than what we had before overclocking. its never gonna happen. BUT what we can do is figure out the best way to maximize battery life when the screenis off....and hopefully this thread can start us in the right directiono
MIKEOD5785 said:
so one thing i must say regardless of the standby tests.....is that i fully expect garbage battery life after overclocking this phone while i am actually using it. overclocking creates heat......and heat is wasted electricity. so its give and take....sure overclocking is great and the phone isblazin fast...but the battery pays the price.
so theres one thing that is a fact of this phone.....it is 100% impossible to overclock the revolution and get better battery life than what we had before overclocking. its never gonna happen. BUT what we can do is figure out the best way to maximize battery life when the screenis off....and hopefully this thread can start us in the right directiono
Click to expand...
Click to collapse
You should not see significant battery drain while using the phone. The idea of over clocking is so that multiple apps can run together without there being any jumping or lag. Your processor should not be running at 1900 when in the phone state. We all know 4g is a battery killer. I don't use 4g. This is a great thread you started.
Sent from my VS910 4G using xda premium
I used my phone as a navigation last night. Plugged into my car charger on the 20 minutes or so ride I lost 2% lol. Oc to 1.9
Sent from my Transformer Prime TF201 using xda premium
Haro912 said:
I used my phone as a navigation last night. Plugged into my car charger on the 20 minutes or so ride I lost 2% lol. Oc to 1.9
Sent from my Transformer Prime TF201 using xda premium
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Click to collapse
Mine actually charges. I started nav the other day at 81 percent, and ended my drive on 83. I think I was in the car for 30 minutes, maybe 40.
Let's see what duder gets, I am very interested.
Running blitz 2.1 @ 1.9/245 with the OEM extended battery my temps never exceed 90f, monitored by battery ETA. That includes full HD streaming. So, not so concerned about overheating.
My battery life is pretty terrible. Running stock, power saver, and Snapdragon battery guru. I have to charge the phone 2-3 times a day. I use in moderately to light through the day. At night, it will drain almost completely while I'm asleep. I had a Nexus 4 before and battery life was way better than this, same location, same apps, etc. I don't feel like I should need to turn data and wi-fi off to get more than 6 hours of virtually idle phone life from this device. Is this typical?
I find the phone is hot a lot too, when I am not even using it.
Please try to find out what causes this drain with the following app and post results after 1 unloading cycle
https://play.google.com/store/apps/details?id=com.gsamlabs.bbm&hl=de
baedaa said:
Please try to find out what causes this drain with the following app and post results after 1 unloading cycle
https://play.google.com/store/apps/details?id=com.gsamlabs.bbm&hl=de
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does this come in English?
Bradlees said:
does this come in English?
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Click to collapse
Tt does, the link included my country code. I'm sorry
https://play.google.com/store/apps/details?id=com.gsamlabs.bbm
baedaa said:
Tt does, the link included my country code. I'm sorry
https://play.google.com/store/apps/details?id=com.gsamlabs.bbm
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Click to collapse
I downloaded it. Shut phone off and letting it charge, then going to see how fast it drains. To boot, its been on the charger for 2 hours and it has gone from 9% to 62%. Something must be wrong.
With stock my phone battery life sucked as well.that's why I rooted it and running a sense 5 Rom.. and it's so smooth I have my kernel UC to less than one gig speed and it still move fast without the overheat
Sent from my HTC One XL using xda app-developers app
Definitely not typical...
I'm fully stock and not rooted. If I dont touch my phone it can last over 24 hours with data on (noticed this one weekend when I was too busy to play with the phone).
I use the Battery Widget Reborn app and it says a "Fully charged battery usually lasts: 18 hours 8 minutes" for me.
Sounds like theres definitely some kind of app in the background thats draining your battery and making your phone hot.
This is pretty typical battery life for me with data always switched on on a rooted stock 4.2.2 rom and was also pretty much identical on an unrooted stock 4.1.2 rom.
The main thing that saves me a ton of battery life is disabling apps that I don't use. By far and away the Facebook app is a massive culprit for killing battery life.
I'm very interested to see the gsam results when you post them.
View attachment 2186489
Ry4n said:
This is pretty typical battery life for me with data always switched on on a rooted stock 4.2.2 rom and was also pretty much identical on an unrooted stock 4.1.2 rom.
The main thing that saves me a ton of battery life is disabling apps that I don't use. By far and away the Facebook app is a massive culprit for killing battery life.
I'm very interested to see the gsam results when you post them.
View attachment 2186489
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I did this procedure that HTC instructed me to do to reset the battery/charging system. I think it may have worked. No excessive heat and a drastic improvement in battery life. I've attached a screen shot of the gsam though. Just curious what you thought of the results
Bradlees said:
I did this procedure that HTC instructed me to do to reset the battery/charging system. I think it may have worked. No excessive heat and a drastic improvement in battery life. I've attached a screen shot of the gsam though. Just curious what you thought of the results
Click to expand...
Click to collapse
You are getting decent battery life. What most here would call bad. That looks like my phone, though. So, you're average.
Bradlees said:
I did this procedure that HTC instructed me to do to reset the battery/charging system. I think it may have worked. No excessive heat and a drastic improvement in battery life. I've attached a screen shot of the gsam though. Just curious what you thought of the results
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Click to collapse
I'd look into your apps check what is using what but other then that you're getting good batt life.
Sent from my HTC One using xda app-developers app
Bradlees said:
I did this procedure that HTC instructed me to do to reset the battery/charging system. I think it may have worked. No excessive heat and a drastic improvement in battery life. I've attached a screen shot of the gsam though. Just curious what you thought of the results
Click to expand...
Click to collapse
Well it's a definite improvement over the sort of battery life you were describing before. There are always ways of improving battery life but as has been said many times before it's all a case of where and how you use your phone that will be the main factor.