Wasabi Power Battery Chamber Cover for Nikon BL-3, MB-D10, MB-40, EN-EL4,

Wasabi Power Battery Chamber Cover for Nikon BL-3. Protects the battery chamber when using an external power supply. (Does not include battery) Allows use of EN-EL4/EN-EL4a battery with: MB-D10 MB-40 Specifically designed for: D700 D300S D300 F6