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If I'm shooting heavily in one day, like an airshow or an auto race, I can get 2,000 to 3,000 shots on one battery. Even with older LP-E6's that have one red bar, I can get thousands of shots.
But if I'm shooting normally, say 200-300 shots per week, I'll get less than 1,000.
+1 That, of course, is because they slowly lose charge. That's why, if I'm going to eg an airshow I check them and top them up the previous day. My son-in-law hasn't learnt that yet and at Red Bull Air Races last week he got through nearly three batteries in an afternoon, whereas I hardly touched 1.