Should last a while, about the same as most other phones. There's no exact figure. Still depends on how many calls you make, how often you turn the screen on... How long is a piece of string?
Sent from my HTC One using Xparent Green Tapatalk 2
You can expect 8-10 hours with heavy usage. 12-14 medium usage and 15+ with light usage...3-4 hours of screen on time MAX (of course this depends on how dark or how bright you like your screen to be)