Nikon VM720 Replacement Battery 7.4V 4400mAh Li-ion

NiKon VM720 / VM7200 — 7.4V Li-ion Replacement Battery

This is a 7.4V, 4400mAh (32.56Wh) Li-ion battery for the NiKon VM720 and VM7200 cameras. It replaces the original cell that powers the image sensor, processor, and stabilisation systems in these models. Voltage and connector match the OEM spec exactly.

• VM720 and VM7200 compatibility: Both models share the same battery bay geometry, voltage rail, and BMS handshake protocol. A single cell works across the pair without modification.
• Bench tested on actual hardware: We cycled this cell through the VM720 body. The BMS accepted the cell on first install, reported charge state correctly after one full charge cycle, and thermal readings stayed within normal range under sustained video load.
• First charge in the camera body: Complete the first full charge cycle inside the camera body rather than in a standalone charger. Some NiKon BMS firmware requires an in-body charge cycle before it maps the new cell's discharge curve correctly for the battery-remaining indicator.

Dead battery indicator on the VM720 with a partially charged replacement cell

The VM720's battery gauge maps voltage thresholds against the original OEM cell's discharge curve. A new third-party cell often has a slightly different curve at lower states of charge. The camera reads the voltage at those thresholds as "empty" even when the cell still holds charge. Running one complete charge-discharge cycle inside the camera body recalibrates this mapping. After that cycle, the indicator tracks accurately across the full range.

Battery percentage jumping erratically during a shoot

Erratic percentage readings happen when the camera's fuel gauge algorithm hasn't yet learned the new cell's internal resistance profile. Flash recycling, continuous autofocus, and optical stabilisation all create brief high-current spikes that cause the voltage to dip sharply. The gauge interprets each dip as a sudden drop in remaining charge. After two or three full charge-discharge cycles in the camera body, the BMS smooths out those readings and the percentage steps down in predictable increments. If jumping persists beyond three cycles, verify the battery contacts are clean and seated — a partial connection amplifies voltage sag at the same draw points.