Hi Mark. Let us know how this grip works out for you. The experience some of us have had with these grips have been varied, from good to bad. I have the Phottix, BP-D80 which has worked very well for me. If you use AA batteries I would suggest the Eneloop type as they will hold a charge a lot longer than any other rechargeable. In mine I use two Nikon batteries with another set as stand by. I also have the eneloops, four sets, for standby and for use in my flash unit. The only drawback to the battery power grip I have run into is the added weight. If you are doing a lot of shooting after a while you do feel the difference in weight.