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Do yourself a favor and stick with the Canon OEM batteries. I've bought Wasabi and other off-brands, some claiming to have higher capacity than OEM's, and every single one of them has sucked, either because they don't have near the capacity they claim or because they won't hold a charge after a few months. Never, ever had a problem with Canon batteries, and I've had a bunch of them.
Interesting, I have NEVER had issues with the Wasabi's. Have ALWAYS had great luck with them. Again, I think the key is to get the Japanese cell's, and not the Chinese cell's.
Do yourself a favor and stick with the Canon OEM batteries. I've bought Wasabi and other off-brands, some claiming to have higher capacity than OEM's, and every single one of them has sucked, either because they don't have near the capacity they claim or because they won't hold a charge after a few months. Never, ever had a problem with Canon batteries, and I've had a bunch of them.