Is there a good app to let me know how long my battery has been going since last plugged in on my MacBook Pro?

I went in my battery settings and can't find anything. I also went in the app store and looked around but the apps there don't look too good. I'm just curious to see how much use I am getting on a single charge. The battery remaining feature isn't really correct and changes too much. Thanks.

?2011-12-17T03:02:17Z

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I did a search and checked with some other techs and could not come up with any thing. Sorry I could not find anything...