I just got 20 hours out of my stock battery with pretty decent use.

I was a little worried at first as it seemed to drain fast but of course some of that was I could not leave my hands off it. lol

Anyways, I have to make several calls a day and use the internet several times a day with work. I forgot to slap the charger on when I went to bed last night, woke up in the middle of the night realizing it and expected it to be dead and it still had life. The battery was in the warning zone but it was not dead.