Akai BPN300 Replacement Battery 6V 2100mAh Ni-MH

Akai BPN300 / BPN350 Series — 6V Ni-MH Replacement Battery

This 6V 2100mAh Ni-MH cell replaces the original battery in Akai BPN300, BPN350, C20, PMVS-8, and over 21 additional Akai camera models. It shares the same voltage rail and form factor as the OEM unit. Dimensions are 88.95 × 47.55 × 20.73mm — verify against your existing cell before ordering.

• BPN300 / BPN350 platform compatibility: These models share the same 6V Ni-MH battery architecture, connector orientation, and physical housing dimensions. The same cell fits across the range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible Akai camera bodies. The BMS accepted the cell without fault flags, and voltage output remained stable across the discharge curve under mixed still and video load.
• First-cycle initialisation on Akai bodies: Run one full charge cycle through the camera body or OEM charger before heavy shooting. Akai camera battery-remaining displays map to a specific discharge curve — skipping this step can cause the indicator to read inaccurately from the first shot.

Camera showing dead battery indicator on a partially charged replacement cell

Akai camera bodies calibrate their battery-remaining indicator against the original cell's discharge curve. A new Ni-MH cell has a flatter discharge profile until it has been cycled at least once. The body reads the incoming voltage and maps it to the wrong point on the curve, which makes a half-charged cell display as empty. Charge the cell fully in the camera body before first use — after one complete cycle, the indicator tracks correctly.

Battery percentage jumping erratically during a shoot

Ni-MH cells have a relatively flat mid-discharge voltage, which makes percentage estimation difficult for camera firmware tuned to the original cell. When flash recycling, continuous autofocus, or video recording spike current draw, the voltage briefly sags and the indicator snaps to a lower reading, then recovers. This is a display calibration effect, not cell failure. If the jumps persist after two full charge cycles, check that the cell contacts in the battery compartment are clean and making full contact — oxidation on either surface widens the voltage drop under load.