Doesn't fit 1DmkIV... probably won't fit other bodies as well,
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This review is from: GSI Super Quality Replacement Battery For Select CANON Digital Cameras, Functions Exactly As Original LP-E4, 11.1V, Li-ion/ 2400mAh, Black (Electronics)
Due to a really bad locking mechanism, this battery will break contact with the camera any time light pressure is placed on the battery or battery compartment. I have no idea whether this is specific to this brand, to a particular production run, or if I just got a lemon, but there was an enormous amount of play in the locking mechanism. I corrected it using an additional washer, but even then the fit was loose enough that occasional stoppages still occurred. As I'd rather pay more than miss shots, my unit was returned quite quickly.
Avoid this one and look to the Wasabi branded LP-E4 clones as I know that those work properly.
GSI Super Quality Replacement Battery For Select CANON Digital Cameras, Functions Exactly As Original LP-E4, 11.1V, Li-ion/ 2400mAh, Black(2 customer reviews)