How many charges does it take for the W900i to reach optimum battery life ? My phone has had 3 charges so far (first was for 16 hours, the others were just until the battery was full). I had almost a full battery today, 1 bar from max, and after watching 3G TV for 45 minutes, the phone just died. Surely that can't be right ? The battery seems to go down a hell of a fast on this even when not watching TV and only making a few calls