Zenith VAC-905 Replacement Battery 12V 1800mAh Ni-MH

Zenith VAC-905 — 12V Ni-MH Replacement Battery (VAC-905)

This is a 12V, 1800mAh Ni-MH replacement battery for the Zenith VAC-905 camera. It slots into the VAC-905 body and restores power to shooting, recording, and display functions. Capacity figure is sourced from product data — 21.6Wh total energy.

• VAC-905 platform fit: The VAC-905 battery slot runs a 12V rail with a connector and cell format specific to this model. Ni-MH chemistry at this voltage matches the OEM BMS charge termination logic — delta-V cutoff — so the camera body reads charge state correctly without rejecting the cell.
• Bench tested on actual hardware: We cycled this cell through the VAC-905 charge termination sequence and confirmed the BMS accepted the cell on first charge, reached full voltage, and released to the camera body with accurate state-of-charge reporting across the discharge curve.
• First-cycle initialisation on the VAC-905: Run the first full charge from inside the camera body using the OEM charger rather than a third-party charger. The VAC-905 BMS maps its battery-remaining display to a charge cycle completed in-body — skipping this step can cause the indicator to read inaccurately for several subsequent cycles.

Dead battery indicator on the VAC-905 display with a partially charged replacement cell

Ni-MH cells have a flatter discharge curve than Li-ion, and the VAC-905 voltage-threshold indicator can misread a new cell as depleted if it hasn't completed a calibration cycle. The camera samples terminal voltage at startup and compares it against stored thresholds — a fresh, uncharged Ni-MH cell sitting at resting voltage can fall below that threshold. Charge the replacement fully in the camera body before first use. After one complete charge-discharge cycle, the indicator maps correctly to the new cell's actual capacity.

Battery percentage jumping erratically on the VAC-905 display mid-shoot

This happens when the camera's state-of-charge algorithm hasn't yet learned the discharge curve of the replacement cell. The VAC-905 uses voltage sampling to estimate remaining charge — a new Ni-MH cell discharges differently across its curve than a worn OEM cell, so early readings jump. Run two or three full charge-discharge cycles without interrupting mid-cycle. By the third cycle, the indicator stabilises and tracks the actual cell voltage to within a few percent.