I know this is a really old, long-running conversation, but I think I've just inadvertently stumbled on the cause of the battery-draining problem with the Fitbit Zip. I finally gave up on mine ages ago after burning through a mountain of disposable batteries. My wife was curious though, so I'd given it to her to play with. She hasn't had a tracker before and wasn't interested in syncing it to a computer or phone. She's effectively just using it like an old-school pedometer - i.e. to measure steps. Suddenly we find the battery has lasted at least two weeks - far longer than I was getting with it. This suggests that it must have been the bluetooth technology which was sucking the life out of the battery. Apologies if this has already been canvassed in this extremely long-running conversation - I haven't read much of it. I suspect Fitbit has known about this for years, and it's not much consolation to any poor soul who might be still trying to get this rubbish product to do what was promised on the box - but interesting nonetheless.
