Nikon mb d10 is an ergonomically designed grip for extended stability and potential for vertical shooting for use with the nikon d300 and d700 the mb d10 grip is supplied with a cradle for an additional en el3e and 8x aa batteries combined with the grip both options will give extended shooting time and easier handling when taking portraits to obtain 8fps when using the d300 and d700 you have to use one of the following combinations bl 3 battery chamber cover en el4a battery or 8x aa batte