I got it at about 2:30pm, set it up quickly as my lunch hour was up. It was at about 55% battery when I left at 3pm, used it for about 8 calls, few texts, then since home at 6:40, been on in non stop, setting up, etc. So, at about 10:10, battery was at 5%, after 7h 22m of moderate to heavy use with almost all kinds of settings on. Plugged in now, already up to 8% while using it. IT'S QUICK! Haven't noticed any lag. Not sure what else you'd like to know, but reply and I'll try to answer.