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
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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.
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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
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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
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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:
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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
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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?
Just thought this was interesting and hadn't seen it posted elsewhere on the Sensation forum.
https://plus.google.com/105051985738280261832/posts/FV3LVtdVxPT
The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory."
No, it does not.
This file is used to maintain, across reboots, low-level data about the kinds of operations the device and your apps are doing between battery changes. That is, it is solely used to compute the blame for battery usage shown in the "Battery Use" UI in settings.
That is, it has deeply significant things like "app X held a wake lock for 2 minutes" and "the screen was on at 60% brightness for 10 minutes."
It has no impact on the current battery level shown to you.
It has no impact on your battery life.
Deleting it is not going to do anything to make your more device more fantastic and wonderful... well, unless you have some deep hatred for seeing anything shown in the battery usage UI. And anyway, it is reset every time you unplug from power with a relatively full charge (thus why the battery usage UI data resets at that point), so this would be a much easier way to make it go away
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I understand the logic behind it, I do, but I've noticed massive improvements at times when doing this, but only when battery is exceptionally bad for no reason. It's not just a pseudo effect, and it's not just draining and charging the battery. I'm talking consistantly getting a few hours per charge, 3 or 4 full cycles, then I wipe stats, and boom, 12 to 20 hours.
So, I'm just gonna keep doing it, it doesn't hurt either way.
Ofc it does not improve battery life. No one ever said that. Only thing it does is let charge your phone to 100% like you would on a official rom.
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Send via the XDA app
Anyway I still erasing my battery stats ...
It was never suppose to improve your battery life, but give you more accurate reporting of how much battery life is left.
bobdelt said:
It was never suppose to improve your battery life, but give you more accurate reporting of how much battery life is left.
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im agreed with you... it doesnt improve the battery, but give more exact battery porcentage
For some reason once my phone hits 8% battery life it drops to 2% immediately.
This happens on viperxl & cm, so its not ROM related.
Any ideas on how to fix it? Is there a way to recalibrate the battery ?
Sent from my One X using Tapatalk
There's nothing wrong with your battery. That's normal behaviour when the battery is at such a low level. The battery percentage is never an exact value, it's only an estimate based on the current voltage that is being reported by the battery. When a battery is that low it isn't abnormal at all for it to jump down drastically like that.
On a side note, unless you're performing an initial charge cycle after flashing a new ROM you really shouldn't let your battery deplete to such a low level. With this specify type of battery technology it's quite bad for it and will actually affect the long term life of the battery. The preferred method of charging is to do regular top up charges from anywhere between ~80% and ~30% battery level right up to the 100% mark.
Sent from my Evita
The_Zodiac said:
Any ideas on how to fix it? Is there a way to recalibrate the battery ?
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There is no such thing as "recalibrating the battery". This term is sometimes used by folks who confuse Li ion technology with old NiCad batteries that need to be "conditioned".
What you may mean is recalibrating the battery meter, which has to do with software, not battery chemistry. Battery meter is usually not accurate after a ROM flash, and should be recalibrated. This is done by charging to 100% (let it sit for half hour or so at full, to ensure any saturation charge is achieved) then deplete until around 10 or 20%.
Other than that, the meter is as accurate as its going to get. As timmaaa already stated, the battery % is just an inaccurate approximation of the amount of usage left that corresponds to various voltages. It often can't be trusted to be accurate to within 1% (or even 5%) increments. And also as timmaa stated, you should not be draining your battery that low on a frequent or habitual basis, as its harmful to the long term life of the battery. Charge frequently.
Replaced battery with Newpower99 battery. Got normal battery time, but very strange readings. Battery goes up when I am not charging it. Anyone have any idea how to fix this?
samdal said:
Replaced battery with Newpower99 battery. Got normal battery time, but very strange readings. Battery goes up when I am not charging it. Anyone have any idea how to fix this?
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Battery stats are pure estimation. The estimated percentage was less than the actual remaining battery capacity, so it readjusted itself.
My battery performance has been awful, and it seems the main culprit is Cell Standby and Screen. Any ideas how to improve it?