Before you shell out for a new battery I would check to make sure you don't have something running in the background on your tablet that's sucking up the battery. I've had mine since March and I'm still getting 8-12 hours of standby with occasional usage with wireless on. If you were getting that kind of battery life with wireless on I would suspect a connection being held open or the use of ad-hoc wireless (powersaving modes can't work well in ad-hoc mode), but if wireless is off I don't know...