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Mike -- You might need two batteries. Probably should have two or four on hand for bigger gigs.
These grips can be strange -- I get that sometimes with my aftermarket 60D grip -- have to play around switching, rotating, until the camera wants to recognize one or more. I've never tried using just one in the grip, always two. I think my 5D2 Canon grip might act up a bit with after market batteries. But it always ends up working fine.
Try what Brian said, load up some AA's in the magazine.
I'm sure it's just finding the...Show more →
Thanks for the suggestion, although the manual specifically states that one or two may be used, and in either slot if one is used. I tried the AA batteries, and that didn't work either. My second LP-E6 battery is currently at B&H getting RMA'd.
I was on hold with Canon customer support for 30mins until I gave up.