The first day, I charged my battery, it lasted for about 4 or 5 hours... (while using wifi...).
From then on, with a full charge I never get more than 2 hours... (with wifi)
I even tested it: full charge.. turn on, play some games for 10 minutes.. turn off.
the next day... turn on... surprise... only 2 bars on the bat metter.... and about an hour of usage....
(It also takes a long time to recharge... 3 to 4 hours...)