So I recently bought a Zeikos 7D grip for.. my 7D. But this is Day 2, and the grip no longer communicates with my camera. Everytime I turn on the camera, it displays "cannot communicate with battery". But, I'm using 1 Canon (OEM, came with the camera) and 1 generic (Power2000). Both the batteries display the battery life / percentage perfectly fine if inserted individually into the camera (no grip). Which leads me to think that there's something wrong with my grip. Any ideas? Thanks!