I had to charge last night after a full day of use But I believe this is do to recording many videos and taken many pictures haha... When I was doing everything else the battery was good but taken videos seems to drain it pretty fast =)
Well the plus side is that you can take the battery back and get a new one. Why don't you do that and see if it will help you. I had same problem with my pearl but after the exchange it's been great since. and i didnt have to pay anythjng.