This battery usage can't be right

Ok today I took both my iphone 4s and my 9930 of the chargers at the same time 11 am. Both phones were fully charged. Here is the problem by 630 pm my 9930 was down to 30 percent battery. The kicker is that I did absolutly nuthing on the BB it was just in my pocket. No emails,web,calls anything. What drained the battery so low? By comparison I had used my iphone for everthing I did today including a lot of video streaming online few call some texts and directions and that is still at 50 percent.This is reminding me of my early htc EVO days. I'm running the most up to date sprint firmware anuthing I should be checking or is the battery that bad?

Soon as I typed this post it dropped to 20 percent WTH

It may be a bad battery. I would bring it to the store and let them have a look at it.

Did you have any apps running in the background?

Sometimes I accidently open Google Maps with my hotkey... oops! That'll run your battery down.

Get another battery.
Upgrade your OS.
Let the battery drain the first and then let it charge for 10+ hours.
You will be fine :)