The original battery in my camera is about three years old. I have taken over 20,000 photos using it. I wanted a back-up battery and the price was right compared to a Canon battery. I did a test with my old battery by shooting a continuous video to see how long it would last. The old battery will go about 1 hr 44 min. I charged up one of the new batteries upon arrival and did the same test. It lasted 1hr 38 min. Pretty comparable except I would think the old one would have lost some of it's power by now. It's still stronger than this new one out of the box, but as a back-up battery I have no complaints. I am happy with it. The charger that came with the batteries is bigger than the original Canon charger but it seems fine. It's good to have an extra charger on hand too. All in all, a very good deal. I would have rated four stars because my old battery seems to still be stronger, but the price is so good I gave it five.
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