BP-80 Chinon CV-765 Replacement Battery 12V 1800mAh

Chinon CV-765 / CV-770 Series — 12V Ni-MH Replacement Battery (BP-80)

This is a 12V, 1800mAh Ni-MH replacement for the original BP-80 battery. It fits the Chinon CV-765, CV-770, CV-C70, CV-C800, and ten additional CV-series models. The battery powers the camera's light meter, shutter mechanism, and flash systems.

• CV-series platform compatibility: These Chinon models share the same 12V battery rail, BP-80 connector footprint, and BMS handshake protocol — which is why a single cell covers the full CV lineup without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on CV-series hardware. The BMS accepted the cell cleanly, managed thermal limits correctly, and held voltage within spec across flash-heavy cycles.
• First charge via OEM charger: Run one full charge cycle through the original Chinon charger or compatible camera body before shooting. Some CV-series bodies need this initial cycle to map the new cell's discharge curve and display battery-remaining accurately.

Flash output dropping mid-shoot on the CV-765 and CV-770

The flash capacitor on these cameras draws a sharp recharge current between shots. As the cell approaches the lower end of its discharge curve, that recharge current sags — the capacitor doesn't reach full charge before the next exposure. The result is underexposed flash frames late in a shoot, even though the camera still shows power remaining. Running one conditioning cycle before heavy flash use reduces this effect by allowing the BMS to map the cell's actual capacity range accurately.

Battery percentage jumping erratically on the CV-series display

This happens when the camera body maps its voltage-threshold indicator against a discharge curve that doesn't match the new cell. Ni-MH cells have a flatter discharge profile than many camera firmware tables expect, so the indicator reads a sharp drop at one threshold and then stabilises incorrectly. The fix is straightforward: complete one full charge-discharge cycle in the original Chinon charger. After that cycle, the body recalibrates its threshold mapping and the indicator reads consistently — verify the cell is reading stable at 12V before shooting.