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OK, I run two batteries in a Canon grip on my 7D.
The two previous batteries (one that came with the body, one bought a year later) both finally gave up the ghost. Hard to complain about getting as much use as I did. (I bought my 7D right after it was first available.)
OK, the two previous batteries always kept pretty close in count. At most, they'd get about five clicks apart (ex: at 205 total, one would be 100, the other, 105)
These two, not.
I've spent the last couple of days intermittently taking shot and the current total since last charge is 629 clicks. Battery "A" is at 282, battery "B" is at 347.
What's up with that?