very sad... the grip cannot read the np400 battries correctly. when i inserted them into my grip, and switch my 7d body on, it starts to AF eventhough i nv press on anything. the left side menu buttons and the rest, most buttons cannot press. nothing will happen. except for shutter button, ael, 4 way buttons and the dials and scrolls.
i tried inserting my other batteries also the same. inserting 1 battery on left, then tried on right, still the same.
what fustrates me is that when i use the AA battery tray with the 6 AAs, it works fine!