Battery Chamber Cover for Nikon MB-D10, good for Nikon D300/D700 DigitalCamera.

The Battery Chamber Cover for EN-EL4/EN-EL4a used with  MB-D10 Grip for Nikon D300/D700.

D700:
Continuous shooting speed is up to 5 frames per second with the included Rechargeable Li-ion Battery EN-EL3e, and up to 8 frames per second when using the optional Multi-Power Battery Pack MB-D10 and Rechargeable Li-ion Battery EN-EL4a/4 or eight AA-size batteries

D300:
Continuous shooting speed is up to 6 frames per second with the included Rechargeable Li-ion Battery EN-EL3e, and up to 8 frames per second when using the optional Multi-Power Battery Pack MB-D10 and Rechargeable Li-ion Battery EN-EL4a/4 or eight AA-size batteries

D300S:
Continuous shooting speed is up to 7 frames per second with the included Rechargeable Li-ion Battery EN-EL3e, and up to 8 frames per second when using the optional Multi-Power Battery Pack MB-D10 and Rechargeable Li-ion Battery EN-EL4a/4 or eight AA-size batteries

Note:

1. This is not made by Nikon
2. This is not good for Phottix BP-D700 grip