Database Info

Battery recalibration after ROM update

http://www.nexusoneforum.net/forum/nexus-one-faq-how-tos/5625-calibrate-your-battery.html
RECALIBRATION:
A recalibration is mostly needed, when dealing with different kernels (ROOT!). Most custom recovery images provide the option "battery stats wipe" under the menue "Wipe".
Here is how ya do it!
1. Enter Recovery Mode
3. Enter "Advanced"-Menue
4. do "Wipe Battery stats"
5. reboot
Calibrate the battery by completely draining it until the phone completely shuts itself off.
Turn the phone on again and let it shut itself off one more time.
Then charge your phone while it is off for over 8 hours.
This will fully charge the battery so that when the Android is turned on, it now sees the battery as full.
It is recommended to repeat this process at least one more time.
You should see a significant increase in your battery’s charge life.
Calibration of a battery can be done at any point and a maintenance calibration is recommended every month.

Thanks for this useful guide

Hi,
Your posted information doesn't sound true for me. Why should recalibrating increase the battery life? The battery is full when the end voltage is reached an no more charge can be taken (4,2v @ lipo) and it is empty if the minimum allowed voltage is reached (should be with Deffy's technology 2,8v?). So why should recalibrating increase battery life?
Greetings, Jo

DOCIOHN said:
Hi,
Your posted information doesn't sound true for me. Why should recalibrating increase the battery life? The battery is full when the end voltage is reached an no more charge can be taken (4,2v @ lipo) and it is empty if the minimum allowed voltage is reached (should be with Deffy's technology 2,8v?). So why should recalibrating increase battery life?
Greetings, Jo
Click to expand...
Click to collapse
It's well known that this procedure will indeed produce better battery performance. Most devices have a similar procedure. Even HTC has given some calibration procedures in order to improve battery performance.

How do you enter Advanced Recovery? I can get my phone into recovery but that's all.

tim440 said:
How do you enter Advanced Recovery? I can get my phone into recovery but that's all.
Click to expand...
Click to collapse
Hey,
You have to user Clockwork MOD recovery, and then when inside it go to Advanced, and you will see the battery wipe option.
cheers

DOCIOHN said:
Hi,
Your posted information doesn't sound true for me. Why should recalibrating increase the battery life? The battery is full when the end voltage is reached an no more charge can be taken (4,2v @ lipo) and it is empty if the minimum allowed voltage is reached (should be with Deffy's technology 2,8v?). So why should recalibrating increase battery life?
Greetings, Jo
Click to expand...
Click to collapse
lion battery recalibration/recondition was already there long before android even existed...

Since I flashed several ROMs I tried this and I am happy! Battery consumption seems to be better after this workaround. I'm on 1.3 Ghz @ 72 Vsel with my Defy and easily reach an uptime of 2 days, mostly a bit more..
Thanks again!

There will be almost no impact on total runtime, just the percentage meter can become more accurate by "calibrating" the battery. In addition to a complete discharge (I do not encourage you to discharge more than ONE auto-off, you shorten the battery life by discharging below 3.0 V) you need to have a nearly constand discharge current on most phones for this calibration to become really accurate.
What is the effect? Well, not much. Your phone just knows better how much battery is left, so maybe the "empty batt" message @15% comes later. The usage time and the auto-off threshold are not impacted at all.
When we are talking about a battery that has been put away for months without use, you may be right. One charge-discharge-charge cycle may bring back some capacity. But this is not true for any regularly used battery.
If you care about battery life time (in months/years, not a single charge): Charging above 4,0 V has a great negative impact on it; Constantly holding the charge @ 3,5-4,0V may nearly double the life of a battery but you can only use about 50% of its capacity this way.

I'm not sure if calibration/full discharge is necessary/recommended. From many readings calibration is not necessary for lithium battery. Actually it is recommended against full discharge as lithium battery has limited full discharge/recharge cycles.

after doing research on all methods to recallibrate checking pros and cons finally i got the answer brothers...its very simple no need for cwm or drain full abttery kill your batery download recallibrate delete batterystat.bin....all fake bother....just do a simple step remove your battery for 2-5 minutes and than on it....you are recalibrated....simple

galaxyfitankit said:
after doing research on all methods to recallibrate checking pros and cons finally i got the answer brothers...its very simple no need for cwm or drain full abttery kill your batery download recallibrate delete batterystat.bin....all fake bother....just do a simple step remove your battery for 2-5 minutes and than on it....you are recalibrated....simple
Click to expand...
Click to collapse
See this screenshot.........i am charging my cell and it is showing also its charging but not even d graph nor the battery icon is increasing .
Seriously help me
see this sir...i hopwe u can help anything in this:crying:

abhinavvaidya90 said:
See this screenshot.........i am charging my cell and it is showing also its charging but not even d graph nor the battery icon is increasing .
Seriously help me
see this sir...i hopwe u can help anything in this:crying:
Click to expand...
Click to collapse
take out battery for about 10 minutes. And then try to charge again.
If you will see same problem i think you need to buy new battery.

http://forum.xda-developers.com/showthread.php?t=1443108

This is firmware problem format your phone and than it will be fine or go to stock firmware

galaxyfitankit said:
This is firmware problem format your phone and than it will be fine or go to stock firmware
Click to expand...
Click to collapse
i did but to no vail

then buy a new battery ?

buy i new battery bro...and if warranty left than go to service centre the problem also ...is your battery swelled up kya?

My phone won't charge to 100

Anyone else experiencing this?
I have tried depleting the battery completely and fully charging it overnight, then turned it on and proceeded to charge again afterwards for 2 hrs but it just peaked at 97 for almost an hour and would not go on any further.
Also tried forcing battery calibration with the battery at 97 with the app. Also did the same thing on a separate occasion with full overnight charge, with recovery wipe battery stats.

This is normal.
It's safer for battery life.
You'll never have 100%.

anremi is right. But you could try bump charging if you MUST have 100% charge.
Sent from my Nexus S using XDA Premium App

So how do I know if my battery is properly calibrated?

kingofthebraves said:
So how do I know if my battery is properly calibrated?
Click to expand...
Click to collapse
if you are at stock, just don't think about it... if you are at custom roms (or just rooted), just use the proper option in cwm recovery (or battery calibration app, from market)

Battery Calibration - Once and for all!

I have read every possible thread you can imagine on battery calibration and can never seem to do this correctly, is it a myth? No matter what I do, if I restart my phone, I end up going from 100% down to 85-86% EVERY SINGLE time.
This is after "bumping it". (letting it drain all the way to 0% and then fully charging again).
This is after using BATTERY CALIBRATION in the market which was told works well. (again, advises you charge to 100% then "calibrate" it via the APP).
This is after charging it to 100% and restarting it, recharging up to 100%, restarting and recharging (repeat, repeat, repeat), and then going into bootloader and wiping battery stats.
None of these have worked, does someone have a sure fire EXACT way to do this properly or is at ALL just hype? Help.

Your battery will never say 100% after a reboot. It sucks up a lot of juice on a power up and the battery doesn't charge during powering on. I usually drop about 10% on a reboot using the rezound battery. That is normal behavior. If you can charge to 100% with the phone on then you're fine.
Sent from my ADR6400L using Tapatalk

Interesting because I've never lost 15-16% consistently although I guess it using some juice to cycle makes sense. Anyone else seen 10+ every restart? Thanks for the help man in either case.

Hmm, never seen this before. On my phone which is running skyraider uc to 768mhz and uv only loses 1percent on reboot or doesn't even lose charge at all. Not sure why your phone is doing that.
Sent from my ADR6400L using xda premium

I am running G3D uc to 768mhz and on restart I may lose 1 - 5% at most depending on if i made any changes that take a longer restart. I bet you are overclocked? no need, under clock to 768mhz and your phone will run as smooth as 1.2mhz..maybe smoother while using less battery

Running liquid 3.2.1 on my T-Bolt with the Rezound battery and I only lose 1% battery at boot up. Never lost more...oh and I have never calibrated my battery. Also I get about 8-10 hours of moderate to heavy use too. All stock clocks btw

Just to double check - or reword... do it this way - if you aren't already.
Charge to 100%.
Wipe Batt stats
Drain to zero without recharging in any way (AKA let it drain until it shuts off on you).
Recharge until 100% (till it says 100%, not just "green."). And unplug.
And you're good! Try that and check back in.

Battery Calibration doesn't work

Ignore the % number, it means nothing. Use the battery monitor widget or another program that will show you the actual battery voltage. A fully charged battery will be somewhere around 4200 mV and a discharged battery between 3600 and 3200 mV. I've also noticed that the rezound battery throws things off as the mAh rating doesn't match up to either of the thunderbolt batteries. This is why the battery monitor widget shows the rezound battery as 2750 mAh instead of 1620.

What I recommend to my Evo peeps [which I have] is this:
-Charge battery to 100%
-Wipe battery stats in recovery
-Let the battery drain, so it manually powers off
-Charge to 100% again, and good to go

Battery Calibration doesn't work
Click to expand...
Click to collapse
By this I mean Google Developers have came out recently and said battery calibration does not increase or have any effect on the state of battery life. All wiping the battery stats does is wipe the stats as to what has been using the battery, etc.
still handy for when you flash a new rom to wipe the stats, but it doesn't improve battery life at all.

smoody said:
By this I mean Google Developers have came out recently and said battery calibration does not increase or have any effect on the state of battery life. All wiping the battery stats does is wipe the stats as to what has been using the battery, etc.
still handy for when you flash a new rom to wipe the stats, but it doesn't improve battery life at all.
Click to expand...
Click to collapse
Actually, the post from Dianne @ Google said nothing about calibration. She only talked about wiping or deleting the battery stats file.

You are correct, however all the battery calibration apps available only delete the battery stats file. So like I said it doesn't affect battery life.

wherestheboost said:
Just to double check - or reword... do it this way - if you aren't already.
Charge to 100%.
Wipe Batt stats
Drain to zero without recharging in any way (AKA let it drain until it shuts off on you).
Recharge until 100% (till it says 100%, not just "green."). And unplug.
And you're good! Try that and check back in.
Click to expand...
Click to collapse
This is what I thought I had done but will do again. The problem is even after its 100% and in between your 1st and 2nd step when I reboot into recovery, it's no longer at 100% and sometimes down to 85%ish. I will try again tho, thanks!

http://rootzwiki.com/_/articles/wiping-battery-stats-is-pointless-says-google-r316
That pretty much says it. Wiping stats and calibrations are placebos.

l7777 said:
That pretty much says it. Wiping stats and calibrations are placebos.
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Click to collapse
Yeah I read that too. But when I flashed my first rom on the tb I got abysmal battery life. 25% in like 20 min. I recalibrated and it got so much better. If its a placebo its a good one.
Sent from my HTC ThunderBolt using Tapatalk

all that says is the the deleting the batterybin file doesn't help. The battery is handled by each by software outside of android itself. So, following the battery calibration from the manufacturer of your phone still might help.

jefferyriess said:
Yeah I read that too. But when I flashed my first rom on the tb I got abysmal battery life. 25% in like 20 min. I recalibrated and it got so much better. If its a placebo its a good one.
Sent from my HTC ThunderBolt using Tapatalk
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Click to collapse
25% in 20 minutes means nothing. The % is an estimated number. Find an app that reads the battery voltage if you want a true reading on the battery's charge. Full is 4.2 volts, dead is between 3.0 - 3.6 volts. Battery life should only be measured in hours from full to dead. I've seen my phone stick on 100% for several hours before as well as sticking at 20% for several hours. Ignore the %. Anyone spending all day looking at a % to judge their battery life should go back to a battery indicator that doesn't show %.

Battery Calibration

Hey Guys,
I've got a problem with the calibration of my battery. I'm currently using cm10.2 by Android1234567 and the app "battery calibration". Here is what I do: I fully charge my phone over night. As i said i use battery caliberation and let the phone fully discharge until it shuts down. Then i put it on the charger again and according to the system it is charging and has 2-3 percent of battery. But when i boot the phone then to recovery(4ext) the recovery says my battery has 12 percent left. Yesterday it even shew 55 percent while systen had 18 percent. Does the calibration go wrong or does the recovery have false information? The time of the recovery is also 2 hours wrong.

the display never shows the absolute actual value, just one debit value. the phone displays a forecast, the forecast in recovery differs from the forecast by the system. only one optical deficiency which has every phone.

SpaceInstrument said:
the display never shows the absolute actual value, just one debit value. the phone displays a forecast, the forecast in recovery differs from the forecast by the system. only one optical deficiency which has every phone.
Click to expand...
Click to collapse
ok, makes sense but why do they differ and which one is the more right value?

XxM4tzexX said:
ok, makes sense but why do they differ and which one is the more right value?
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Click to collapse
I'm not a developer so I can´t tell you the details... sorry

XxM4tzexX said:
ok, makes sense but why do they differ and which one is the more right value?
Click to expand...
Click to collapse
For optimal value in system, fully charge your battery and drain it three times without restarting your phone. Work for me :thumbup:
Sent from http://technolies.blogspot.com

XxM4tzexX said:
Hey Guys,
I've got a problem with the calibration of my battery. I'm currently using cm10.2 by Android1234567 and the app "battery calibration". Here is what I do: I fully charge my phone over night. As i said i use battery caliberation and let the phone fully discharge until it shuts down. Then i put it on the charger again and according to the system it is charging and has 2-3 percent of battery. But when i boot the phone then to recovery(4ext) the recovery says my battery has 12 percent left. Yesterday it even shew 55 percent while systen had 18 percent. Does the calibration go wrong or does the recovery have false information? The time of the recovery is also 2 hours wrong.
Click to expand...
Click to collapse
Hi
Just read THIS

Does it make a difference if I plug it to power at 1% before the phone goes off or drain it til it goes off ?

ahsan64 said:
Hi
Just read THIS
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Click to collapse
So the app batttery calibration is useless because these stats are wiped anyways every time I charge my phone. But the article doesn't give any way to actually calibrate the battery or to reset the information if the phone kept 80 % as fully charged.

And my second question: is calibration needed on sense roms? Because every aosp thread says to give the phone a few cycles but I haven't seen this in sense threads
Sent from my HTC Sensation using Tapatalk 4

XxM4tzexX said:
And my second question: is calibration needed on sense roms? Because every aosp thread says to give the phone a few cycles but I haven't seen this in sense threads
Click to expand...
Click to collapse
yes and no, because around the battery topic is much voodoo
after flashing a aosp rom, many users complain that the battery will quickly empty - why? a aosp rom consumend more power as a sense rom.
Do not deal too much with the calibration - with voodoo. at every restart or complete charging the battery calibration file to be deleted and recreated. if you need more power then freeze apps which are not needed with greenfy

In fact there is no battery calibration thing with our phones. Lithium batteries doesnt suffer from memory-effects.
What you mean by calibration is just a file where the actual power consumption with the corresponding voltage or vdrop is stored.
As this file growths the more precise the system shows the current percentage battery left.
This is exactly what the devs mean by saying to let the ROM "settle" a few charge cycles.
Gesendet von meinem HTC Sensation mit Tapatalk 4

I try to calibrate my battery but no luck and turn out there is no battery calibration... just wait battery to drain than fully charge about 3 times if you get the same stats or rebooting just buy an anker

Battery issue

I recently received a used nexus s 4g. I have installed slimbean and a custom kernel to enable voodoo sound. I have been having a weird battery issue. I can charge the phone overnight at which point the phone says it is fully charged. If I turn the phone off for a few hrs when I turn it back on the battery says it is only ~25% charged. This incorrect since I can still get full battery use out of the phone after this. I wouldn't worry but I am using setcpu and have profiles enabled and they are based on battery percentage. Any help is appreciated.
Slimbean ROM slim-4.2.2.build.8-OFFICIAL
Air Kernel
Have also tried matr1x kernel with same issue
Also tried a new battery.

joshritger said:
I recently received a used nexus s 4g. I have installed slimbean and a custom kernel to enable voodoo sound. I have been having a weird battery issue. I can charge the phone overnight at which point the phone says it is fully charged. If I turn the phone off for a few hrs when I turn it back on the battery says it is only ~25% charged. This incorrect since I can still get full battery use out of the phone after this. I wouldn't worry but I am using setcpu and have profiles enabled and they are based on battery percentage. Any help is appreciated.
Slimbean ROM slim-4.2.2.build.8-OFFICIAL
Air Kernel
Have also tried matr1x kernel with same issue
Also tried a new battery.
Click to expand...
Click to collapse
Hi There,
Probably there might have been a lot of battery stats accumilated in your phone try to wipe battery stats but first charge your phone to 100% then wipe Battery Stats in CWM. Aslo clean the terminals of the battery. And flash a custom kernel which maximizes battery life in Nexus S