sometimes the battery is pretty good, like 15 hours of moderate use, and other times its absolutely horrible. For example the htc battery monitor shows that it's been unplugged for 3 hrs 35 min with a 96% charge and with the screen on for approximately half the time the battery is at 34%! It has gone down 2% just typing this Damn reply! Honestly of my 30 days weren't past I would replace this for the photon. Hell I would try to get a replacement evo 3d if i wasn't past the deadline.....?