After reading some customer reviews and prices compared by with battery grips for Canon, I was very skeptical. But now I am very satisfied. As is so often described, very much volume is presented in this handle. Under the trigger could install a similar battery compartment as on the other side of the case. But the manufacturer said that a battery in the handle is enough. Some providers for Canon handles provide the way the ability to use commercially available batteries or batteries from the supermarket. Anyway, I've just always with the battery in the camera and the handle. In order to get through the rounds and the battery grip improves the weight distribution when using heavy lenses or a large flash. I have at best average sized hands. But in any attitude of the battery grip is a relief for a rapid, accurate snapshot or an image series.