currently using iphone 3gs. i always charge the battery to full before going to bed(1-2am).the next day the % always drop to like 90% (alarm 8am). and after 1-2 hours the battery drop to like 85%, i only check the message once or two times in this period. so is it normal?

not yet, always get the prompt everytime connect to itunes. should i backup before install?

how to identify what apps are running on the background? normally after using apps, i just push main menu button back to home screen.

i will try that thanks. i hope it works, everytime i unlock, and start using even sending a sms, the battery % will drop 1% then slowly 2-3%, i need to charge every 2 days thats quite frustrating.

hello guys, so i tried to charge to full battery and switch off the power and switch on again before i went to bed. i've done all settings i can to save the battery life(3g off, wireless off, push off, location service off, email checking to never, etc). this morning i checked, the battery dropped 5% when i was sleeping - -" (8hrs). i've updated to 3.1.2 as well. so i guess this is abnormal for 5% drain while standby?