Are you using Smart Actions or Juice Defender?
I can easily pull a 15 hour day pushing the battery hard. I couldn't ask for better really. Today is a modest use day (including sleeping for 5 hours) but I am at 20 hours off charge with 51% battery remaining. I have done everything I usually do, just not tons of it. (This is with wifi and 4G but 25% display which is perfect for me unless watching Netflix)
SAH_WEET