Yep games is what does it for me, runs battery right down, I wish though that my iphone 3GS battery lasted as long as my ipad lol charging mu iphone twice a day.
For me the X-plane 9 app drains battery very fast.The second game that drains my battery very fast is Modern combat 2 in Multiplayer mode.Still much better than my HP laptop which drains the battery in 45 min.)