Hey bud,

Have you checked to see whether you have any apps that you've set to constantly e.g. check the web for updates/refresh material etc? Loads of widgets?

Also, If you're using launcher pro, make sure the 'keep in memory' option is disabled.

Also, this is isn't really a solution per se, but I bought this not too long ago and it's a LOT better than the stock:

Anker 1900mAh Li-ion Battery for Samsung Galaxy S II: Amazon.co.uk: Electronics


Other than all of those don't know what else to suggest so will leave it open for someone else to have a go....

 

My SGS2 is operated under the same set up as you report for yours. From 2300 @ 100% charge, by about 0900 next morning I will typically have lost 2 to 4 %. Your 25% loss over a slightly longer period is enormous. I use Juice Defender Ult. Android System 24% Android OS 15%.

Unrooted and with Tesco Mobile.

 

try CPUspy and also Battery Monitor. I found that Bettery Battery Stats is great for those apps using wakelocks and getting them killed off. Also remove any silent GEO location such as latitude from working.

 

Some excellent information is posted here on this issue:

Android OS process eating away battery life - xda-developers

 

Yeah go for the factory reset, maybe if you start loading up your phone again in increments (in terms of apps), you might be able to notice the guilty-party if there is one.

And yeah, the Anker really improves things....gives me about an extra 3/3.5 hours. Make sure you calibrate the battery as that might help too.

 

You see the highlighted part of your post? That's your problem. Android OS should not be running into hours. I had it once. The only difference is that I only had the phone on for a couple of hours and the Android OS show usage way more than that.

There's probably something wrong with the meter and the meter would not get reset just by booting it. You need to either remove the battery or recharge it to full again. I suggest recalibrating the battery.

Cheers

 

It is for me. The "Phone signal" bar on the Battery Usage graph displays a constant signal but cell standby time always shows the same as yours. As I can make/receive calls without this altering I've decided that it's broken.

 

BTW, my Android OS usage was always way up around 65% until I started to turn off Wireless when I wasn't using it. Now it runs around 7% and battery life is much improved. Obviously our wireless modem usage gets bundled into Android OS usage. The biggest battery user on my phone is now the display and Radio (I'm always running the radio) so if you turn down brightness a bit, you should get better battery.