Is there an app that shows what is draining my battery?

[golflover1]

Some days my battery last all day and has 50-75% left at the end of the day. Some days it's dyeing by noon. I use the same apps in pretty much the same way every day. I can't figure it out.

I'm running the stock 6.5 from Verizon. I use Skyfire, Opera, Opera mini, FB 1.5 and I usually exit the app when I'm done with it. I receive about 20 SMS messages a day. I send maybe 1-5 messages a day. The display is off 80-90% of the day. My average call time is usually under 30 minutes.

Is there an app that monitors resource usage over a period of time and tells me what is draining my battery on the bad days?

Thanks.