Here's a good post I found. I take no credit for this. You can click the little arrow next to the OP's name in the quote to be taken to the original post. i'm personally giving juice defender another shot. I was consistently getting 20 hours or more with it and now I'm getting 10 to 12 hours with 4 hours of screen time. Since I am awake for about 18 hours of the day, this is not acceptable.