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I've never used the silly 750ma canon battery - I don't know why they bother. I bought 4 1200mAh batteries off eBay and have been using them since.
A set (using battery grip) usually last a full night no problem. In fact, usually 2 nights. How many hours is that? not sure exactly. Never timed it precisely. I'd say at least 4 hours on a set.
Roger.
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