One of these went from 40% to nothing in a few minutes, and one of them is now not resetting the shots taken count to zero after I recharge it. The battery did originally reset the number shots taken in the battery menu after I recharged it - so there's something weird going on with this thing.

This battery lasts much longer than the original. I'll keep this one in the camera.

Very handy to have a spare battery for the camera.