I feel like an idiot for asking this question, but even after using the manual for the camera, it isn't clear to me how to change the battery. It's easy enough to get the grip off, but after that I don't see the "battery release lever" mentioned in the manual. As it stands now, the battery is hidden from view. How do I get it out of there? Incidentally, I think I could get spoiled on some of the automated features of this camera. How did we ever survive before cameras could automatically compute the minimum f-stop necessary to achieve the depth of field necessary to cover the space between two specified focus points?