I got my camera from a friend and they had this adapter that allowed them to put 2 batteries in the camera instead of the standard battery. And they lost the door that covers the hole where the battery goes in. It was really difficult to find a replacement until this one came along and it literally fitted perfectly. So if for some reason you ever need it, this is a good option. I also have a Canon T3i camera. I don't know what other cameras will fit.
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