Meike Professional Battery Grip for Canon EOS 6D - similar to BG-E13 - for 2x LP-E6 and 6x AA Batteries (Electronics)
I'm always careful and critical of third-party products, especially in terms what accessories for my DSLR, have in this regard already had a bad experience, for example in the old 50d with a battery grip, which was indeed well equipped (AA-cell sled,