I tested using the one battery I own for my em5 in the grip instead of the body...screen was choppy, autofocus was slower, and ibis seemed to be acting a bit strange. Is it possible that this configuration isn't providing sufficient power to the camera? I found changing the setting within the camera's menus to use the grip's battery before the body's to help slightly, but only slightly. I can only assume that Olympus' intent was that the grip would hold an additional battery, not hold the sole battery. Am I wrong? Apologies if this has been discussed before.