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Specification: Specifically designed for Nikon D800 D800E D850. For use with for Nikon MB-D12/MB-D18 Multi-Power Battery Pack and EN-EL18 Rechargeable Li-ion Battery. The BL-5 is a battery chamber cover for use when powering the D800/D800/D850 D-SLR with the MB-D12/MB-D18 Battery Pack and using the EN-EL18 rechargeable lithium Ion battery. Protects the battery chamber when using an external power supply