About this replacement
NiKon Coolpix D7000 / D800 Series — 7V Li-ion Replacement Battery (EN-EL15)
This is a 7V, 2050mAh (14.35Wh) Li-ion replacement cell for the NiKon EN-EL15, EN-EL15A, EN-EL15B, and EN-EL15c battery family. It fits the Coolpix D7000, D800, D800E, and 28 additional NiKon DSLR bodies that share this battery platform. Voltage and form factor match the OEM cell exactly.
- D7000 / D800 battery platform: NiKon built the D7000 through D800 series around the same 7V rail, connector pinout, and BMS handshake — which is why one cell covers all these bodies. The EN-EL15 line evolved through four revisions (EN-EL15 to EN-EL15c), with each revision adjusting BMS communication firmware, not the core voltage or capacity spec.
- Bench tested on actual hardware: We cycled this cell through the D800 body and a compatible third-party charger. The BMS negotiated correctly on both, reported state-of-charge accurately after one full charge cycle, and held voltage within spec across continuous shooting and video recording loads.
- First-use charge protocol for NiKon DSLR bodies: Perform the first full charge cycle inside the camera body using the OEM MH-25 charger or a compatible equivalent — not a generic USB adapter. Several NiKon DSLR bodies need one in-body charge cycle to map the new cell's discharge curve to the battery-remaining indicator correctly.
Why the D800 battery percentage jumps erratically on a new cell
NiKon's fuel gauge maps voltage thresholds against a learned discharge curve stored from prior charge cycles. A new cell has no stored history, so the body interpolates percentage from raw voltage alone — which produces jumpy or non-linear readings. After two or three full charge and discharge cycles, the camera body recalibrates its curve mapping to the new cell. Until that recalibration completes, treat the indicator as approximate rather than precise.
Camera body showing "no battery" or rejecting the cell on first install
Some NiKon DSLR bodies run a BMS authentication check on first contact with a new cell — if the stored voltage is below the body's acceptance threshold, the camera flags it as absent or invalid rather than depleted. Remove the cell, place it in the OEM MH-25 charger until the charge indicator goes solid, then reinsert it. The body should recognise the cell once it reads a voltage above approximately 7.2V.