Are they in the vertical grip .Then still occurs the strange phenomenon. If you switch the camera off and wait a few minutes, then you get after turning an empty battery icon and the camera will not operate. Taking the battery out of the carriage handle the display switches to immediately and correctly shows the full battery in the camera. Now you can insert the slide again and the camera is operating normally. This can be repeated as often. It indicates that the battery is suitable for handles Product Features Nikon D7000 D600 D800 Nikon 1 V1 (From 11.01.2013: Suitable for Battery Grips)