Their is a lot of threads about this already you can fix it by looking at what widgets you have open. I took ATK off and it improved my barry a lot. You can also dim your screen, turn off gps and bluetooth when your not using it. Social widgets take up a lot of battery. Just look at what you don't need to be running all the time and shut it down.
Seidio hasn't released there's yet. I was in my local verizon last week and the salesman said they had an extended battery, but I didn't even look at it. Most likely something is coming out quickly.