My first smartphone and I was worried about the battery life as I am a fishing guide on a small boat in salt water, and need to have my phone work while on the water. While out, I only used my phone as a "phone", and internet when needed..some google maps etc, I unplug about 6am, and by 5pm I still have at least 50%, if not 75%. So if you need it to last you will be fine. If I use it only for about a dozen calls I will definitely still have 75% or so. Of course you can kill it by downloading and surfing, leaving the screen on non-stop. I used google maps with gps on for about 3 hours and was down to around 30% I think, screen on whole time...