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Why is my Galaxy S2 battery so poor?

post #1 of 21
Thread Starter 
Hi all

I have a galaxy s2 in the UK and I have recently rooted the phone because my battery seems so poor. I have got setcpu on to downclock the cpu to max 100mhz whilst the screen is off. Last night i charged my phone to 100% and then turned off 3g, wifi and put phone to airplane mode.

I woke up 8 hours late and found my phone at 85%. Which to me says that had i left my phone on standbye it would only last 48 hours. Official specs reckon in standbye the phone should last over 700 hours.

Why is mine so poor?
post #2 of 21
This is how long on average an S2 will last:

http://www.gsmarena.com/samsung_galaxy_s_ii_ics_vs_gingerbread-review-737p4.php

That's pretty spot on, also when charging make sure to use the wall charger versus using the USB since the phone holds it's charge better when charged with the wall charger.
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post #3 of 21
Thread Starter 
But I checked my battery status overnight and theres numerous small blips on the radar where it says its awake, even though ive not touched the phone?
post #4 of 21
First off, when you got the phone did you do a proper dis-charge and charge to prime the battery?

It's always good practice that when you get a new phone to completely drain it first. Once drained, charge the battery in the OFF state for at least 8-10 hours. Now this should be done at least 3 times (meaning you let it drain completely 3 times) and you're battery should have been properly primed after that.
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post #5 of 21
You can also try and download "battery calibration" in the PLAY store and then make sure to have your battery at 100% (recommended) and then use the app to calibrate it.

This should work since you've already rooted your phone.
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post #6 of 21
Airplane mode should be around 0.5% drain every hour. In your case, you either have a bad battery, or an app running in the background eating your battery.

My galaxy sii is the US version though. Yours may be different.

Sent from my Galaxy SII using Tapatalk
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post #7 of 21
Did you turn off the GPS?? HUGE battery drain if you keep that on
 
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post #8 of 21
Thread Starter 
Quote:
Originally Posted by arctia View Post

Airplane mode should be around 0.5% drain every hour. In your case, you either have a bad battery, or an app running in the background eating your battery.

My galaxy sii is the US version though. Yours may be different.

Sent from my Galaxy SII using Tapatalk

hmm well airplane mode last night drained 2% an hour, even with a huge cpu underclock.

Quote:
Originally Posted by loud681 View Post

Did you turn off the GPS?? HUGE battery drain if you keep that on

Everything is off...literally everything. Wifi, cellular, GPS, bluetooth, screen brightness minimum.
post #9 of 21
grab a new kernel for it, or a ROM with a kernel, and try another CPU governor.

go to xda developers forums for this issue.
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post #10 of 21
Thread Starter 
whats a rom with kernal mean?

Ive literally just rooted it with syia s2 v5.01
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