The BL-3 is a Battery Chamber Cover for the MB-D10 Multi-Power Battery Pack that allows the use of an EN-EL4/EN-EL4a battery with the D7000, D300S and D300; and for the MB-40 Multi-Power Battery Pack, to use with the F6.
The BL-5 Battery Chamber Cover for the MB-D12 Battery Pack from Nikon is a battery chamber cover that's used with the MB-D12 Battery Pack and EN-EL18 rechargeable lithium ion battery, when powering the D800, D800E DSLR. Battery not included.
The BL-6 is a Battery Chamber Cover for the D4 and EN-EL18 rechargeable battery.
The Nikon MS-41 is the standard replacement battery tray for the F6, and accepts two CR-123A batteries.
The MS-D11 is a AA battery holder for the MB-D11 Multi-Power Battery Pack.
The Nikon MS-SD9 Battery Holder is the replacement battery tray for the SD-9 Battery Pack, used with the SB-900. The tray holds up to 8 AA batteries.
Double your battery life and increase comfort during vertical shooting by adding the Pentax D-BG7 Battery Grip to your KP DSLR. It holds one D-LI90 battery pack in addition to the one already in the camera, ensuring longer shooting times without changing...
The D-BH109 AA Battery Holder for the Pentax K-r, K30 Digital SLR Cameras from Pentax is an optional holder for the camera that accepts four "AA" batteries.