how to calibrate your android's battery

30/05/13 How To Calibrate Your Android's Battery

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How To Calibrate Your Androids Battery29/07/2011

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Making your Androids battery last longer is a fairly simple task, disable push notifications,

manage your 3G usage, turn off GPS, the list goes on. However what you may not realise

is that your battery life may be being hampered by incorrect calibration. Basically your

battery stores no information, its juice is measure by a stats file on the device itself; if that

stats file is wrong your battery life will read wrong. Your battery stats file can be incorrect

for reasons such as flashing a new ROM, therefore after each ROM flash you should

calibrate your battery.

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Tags - Android, feature Category - Android, Tutorials/Tips/Tricks

Note: To properly complete battery calibration you need root access.

The method is in two process, steps 1-4 are conditioning, this allows the battery to make

sure its absorbing as much juice as it can. The remaining steps are calibration

steps which work by re-writing the battery stats file on the device.

The Method

1. Run down your devices battery until it turns itself off

2. Turn it back on and wait for it to turn off again; this may be straight away of after a few

minutes

3. Remove the battery for at least 20 seconds

4. Replace the battery and charge until full and then for at least another hour while the

device is off

5. Delete you batterystats.bin file using one of 3 methods (requires root): Terminal Emulator

type su then press enter, next type rm /data/system/batterystats.bin (without quotes).

Using a Battery Calibration App (from market) there are many choices available, they

just delete your batterystats.bin file. In market, search for battery calibration. Make sure to

read review and provided info in case of device incompatibilities. Manually if for any

reason the previous two methods didnt work you may want to try deleting the file manually.

Using a file manager with root access (such as Root Explorer) navigate to

data/system/batterystats.bin. Delete batterystats.bin

6. Your device will now creates itself a new batterystats.bin file with a correct 100% battery

reading.

7. Run down the battery until it turns itself off

8. Turn on the device and charge for at least 8 hours

9. Unplug the device, turn off and charge for another hour

10. Unplug the device, turn on and wait for 2 minutes

11. Turn off and charge for another hour

12. Use the device as normal!

You really only need to do this very few months or when you change ROM. Providing you

dond change any major settings the battery stats file will remain accurate.

Note:

This may not always produce results because your battery stats file may not be affected at

all.

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