Got you. So the lid of the battery is the back plate of the N810. BTW I find it very difficult to open and (esp.) close the lid. When closing, my tip is to put the lower right hook in place first, then tuck in the upper right tab (while you are doing this, the left side will tilt downward). Follow by tucking in the upper left tab. Finally snap the lower left part (forgot the shape) in place.