I have a Canon 60D.
I'm looking into buying a battery grip for the extra battery life. I also recently purchased a set of 16 PowerEx 2700 mAh batteries. I'm curious, will the battery grip with 4 of these 2700 mAh batteries last longer than my standard camera battery? I notice when shooting with the 70-200is the battery drains pretty quickly. Is two canon batteries a better option? I still think it would be nice to have in my bag in a pinch to have the option to run my camera on AA's...
Let me know your thoughts.
Thanks!

