Sharp BT70 Replacement Battery 6V 2100mAh Ni-MH

Sharp BT70 / BT77 / BT80 Series — 6V Ni-MH Replacement Battery

This is a 6V, 2100mAh Ni-MH replacement battery for Sharp camcorders and digital cameras including the BT70, BT77, BT80, and FZ168, plus 28 additional compatible models. It slots into the same battery bay as the original cell and connects through the same contact points. Capacity is 2100mAh (12.6Wh), matching OEM specification.

• BT70 / BT77 / BT80 / FZ168 series compatibility: These Sharp models share the same 6V battery rail, physical form factor, and contact layout. One replacement cell covers the full range without any modification to the battery bay or charging path.
• Bench tested on actual hardware: We cycled this cell through the Sharp OEM charger and monitored BMS handshake, contact voltage, and charge acceptance. The cell reached full charge without fault codes and held voltage within spec across a standard discharge curve.
• First-cycle acceptance on Sharp camera bodies: Run one full charge cycle through the OEM charger or camera body before heavy shooting. Some Sharp camera BMS systems read battery-remaining percentage from a mapped discharge curve — a cold cell that skips this step can cause the indicator to misread from the first frame.

Battery percentage jumping on the Sharp BT70 display after fitting a new cell

Sharp's battery indicator maps percentage to a voltage-threshold table calibrated against the original cell's discharge curve. A fresh Ni-MH replacement starts with a slightly different surface charge profile, which can cause the display to skip from 80% to 20% without warning. This is a calibration mismatch, not a faulty cell. Run two full charge and discharge cycles through the camera body — by the second cycle, the BMS re-maps the curve and the display stabilises.

Dead battery indicator showing on the Sharp BT77 or BT80 with a replacement cell that still has charge

Sharp camera bodies use a voltage floor check at startup — if the resting voltage of a new or storage-discharged Ni-MH cell reads below approximately 5.4V, the body flags it as depleted and refuses to boot. This happens most often when a replacement cell ships partially discharged. Place the cell in the OEM charger for a full charge cycle before inserting it into the camera body. Once the charger confirms a full charge, insert the cell and power on — the camera will accept it at that point.