This problem just started for me, I'd say in the last 2 weeks. Only a few hours after taking my phone off charge at 100% my battery was very low. 30% or so. This is unusual for my use. Looking at the battery use screen always shows browser as using 80% or more of my battery. It seems like if I start the browser, it keeps running in the background, and for some reason is using tons of power. I do have an app killer program, but sometimes I forget to use it. I thought one of the big bennefits to the Android OS was it's ability to automatically shut down programs not in use to preserve memory and battery life. So, what gives?