Loewe H801 Camera Replacement Battery 6V 4200mAh Ni-MH

Loewe H801 / PROF180 Series — 6V Ni-MH Replacement Battery

This is a 6V 4200mAh Ni-MH replacement battery for the Loewe H801, H811, PROF180, and PROF185 cameras. It matches the original cell's voltage and chemistry, keeping the camera's BMS handshake intact. Capacity is sourced from the product specification at 25.2Wh.

• H801 / H811 / PROF180 / PROF185 compatibility: These models share the same 6V power rail, physical form factor, and BMS communication protocol. A single cell revision covers the full group without modification or adapter.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on camera hardware and monitored the BMS handshake at each stage. The protection circuit held cutoff correctly at low-voltage and the camera accepted the cell without error flags after one full charge cycle.
• First-install charge cycle on Loewe bodies: Insert the new cell and run one complete charge cycle through the camera body or OEM charger before shooting. Some Loewe BMS builds require this cycle to calibrate the battery-remaining indicator to the new cell's discharge curve — skipping it can cause the display to read inaccurately from the first shot.

Why the H801 battery indicator locks at one bar then cuts off without warning

The H801 maps its battery-remaining display to a fixed voltage threshold table written for the original cell's discharge curve. A new Ni-MH cell — even a healthy one — has a flatter discharge curve than a partially aged cell, so the camera misreads where it sits on that table. The indicator stalls at one bar while voltage is still well above cutoff, then drops suddenly when the curve finally steepens. Running one full charge-discharge cycle from inside the camera body forces the BMS to re-sample the curve and update its threshold mapping.

Battery percentage jumping erratically during continuous shooting on the PROF185

Continuous autofocus, image stabilisation, and burst-mode buffer writing all spike current draw simultaneously. These surges cause instantaneous voltage sag that the BMS reads as a sudden drop in state-of-charge, producing large jumps in the displayed percentage. The percentage then recovers when draw drops between frames. This is a measurement artifact, not cell failure — if the camera continues to operate normally, the cell is functioning within spec. Check actual resting voltage with a multimeter after shooting: a healthy fully-charged Ni-MH 6V pack should read above 7.2V at rest.