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Nikon's BL-6 Battery Chamber Cover is a protective cover designed for use with the EN-EL18/EN-EL18a rechargeable battery when it's being used with the Nikon D4, D4S, or D5 DSLRs. It is a spare or replacement item for the cover originally included with the camera body.
For EN-EL18/EN-EL18a battery and D4, D4S, and D5 cameras