BOSC BA-610 Fujifilm Camera Compatible Battery 6V 2100mAh

BOSC BA-610 / BA-611 Fujifilm FinePix Series — 6V 2100mAh Ni-MH Replacement Battery

This is a 6V, 2100mAh Ni-MH replacement battery for Fujifilm cameras using the BA-610 and BA-611 cell designations, including the FinePix C-51, C-61, and compatible models. It replaces degraded or failed original cells and restores full camera operation. Capacity figures are drawn from the product specification — 12.6Wh total energy.

• BA-610 / BA-611 platform coverage: These model designations share a common 6V Ni-MH cell format, connector pinout, and physical envelope across the FinePix compact range. The BMS in each body reads cell voltage against the same charge curve, so one cell fits the full group without wiring or housing modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a FinePix body, monitoring BMS handshake and cell acceptance at each stage. The protection circuit held voltage within the expected Ni-MH discharge window throughout, and the camera body reported battery status without error flags.
• First-cycle charge protocol for FinePix bodies: Run the first full charge through the OEM charger or the camera body itself before shooting. Some FinePix BMS firmware only maps the battery-remaining indicator correctly after it has observed one complete charge cycle from within the accepted charge path.

Flash recycling slowing down mid-shoot on a fresh BA-610 cell

The built-in flash on FinePix compacts pulls a surge of current each time the capacitor recharges between shots. A Ni-MH cell that hasn't completed its first conditioning cycle has not yet reached full capacity, so internal resistance is higher than rated. That extra resistance causes voltage to sag under the capacitor recharge load, and the flash takes noticeably longer to ready itself. Run two full charge-discharge cycles before heavy flash use and the recycling speed normalises.

Battery percentage jumping or reading incorrectly after fitting a new cell

Fujifilm FinePix bodies map the battery indicator to voltage thresholds calibrated against the discharge curve of the original cell. A new Ni-MH replacement has a slightly different voltage slope until it has been conditioned, so the body misreads its state of charge and the percentage display jumps or drops suddenly. This is not a fault with the cell — it corrects itself after one or two complete charge-discharge cycles. Charge the cell fully in the camera body before the first use to give the BMS an accurate baseline, targeting a full charge at 1.4V per cell.