mine goes in cycles. with dark background, mobile data off(it does help, i don't care what the verizon store people say), and my brightness turned all the way down i can go two days without charging. some days the life seem to get sucked out the phone very quickly. those days are few and far between. i don't trust the battery status indicator either. i have run my phone a long time with 20% battery left.
now, if i am in a weak signal area or a completely dead area my phone will go from a full charge to completely dead in 3 hours
that is the only thing I can gripe about with verizon. i thought this problem was limited to android smart phones but my dad's casio ravine flip phone does the same thing. i am new to verizon. this sort of thing never happened with my old provider. my nokia express music would stay charged with zero signal and moderate game playing for days on camping trips.