I took mine out of the box yesterday and played with it heavily for hours until the battery was under 20%. I then plugged it in and let it charge fully and left it unplugged all last night to compare it to my HTC Evo battery life for the hell of it. When I woke up it was at 97%. I have wifi, iCloud, email syncing, and pretty much everything turned on except for bluetooth. I'm using the default email client for my gmail and iCloud for contacts and such. More than happy so far, I love this phone.