[fei2010]

my bb9700 is less than one year old, battery is about 3 month old. recently the battery life is too short. OS platform:5.1.0.175, app version: 5.0.0.862(1446).

I don't have any application running in the background, except those can't close: brower, home screen, phone, bb messenger, message. I have three personal emails and one corporate email(BES).

in the past, usually it can last for more than one day, with light use of phone, email, map etc.

but recently the battery can't last for a few hours: fully charged at 11PM and left it overnight, at 6am the battery only has 60% of life!

what could be the culprit: device, OS, or battery?

Thanks!