Battery life is about the same or better depending upon your carrier. CDMA carrier in the cases on the site anyway, seem to be adversely impacted with battery life challenges. If possible, I would definitely change carriers and get the GS6. From a speed and performance as well as the added features, you're getting one of the smoothest devices. It's definitely worth the trade off versus battery life. Better camera, faster chipset, brighter QHD screen, dual wireless charging standards with no need to buy anything, tap n go and MST, and definitely more premium materials. TouchWiz UI is smooth and definitely the nest to date although it could still use more optimization.