Cullmann 8160 Replacement Battery 6V 4200mAh Ni-MH

Cullmann 8160 Series — 6V Ni-MH Replacement Battery

This is a 6V, 4200mAh Ni-MH replacement battery for Cullmann camera equipment including the 8160, 8162, 8164, and 8165 models. It slots into the same battery compartment as the original cell and operates at the same voltage rail. Capacity is rated at 25.2Wh from the product specification.

• 8160 series compatibility: The 8160, 8162, 8164, and 8165 share the same battery form factor and 6V power rail, which is why one cell covers the range. The connector orientation and BMS interface are consistent across these models, so no adapters are needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench to confirm the BMS handshake completes correctly and the protection circuit trips at the expected low-voltage cutoff. Capacity held within tolerance across repeated cycles.
• First-use charge cycle on Ni-MH cells: Ni-MH chemistry benefits from a full charge via the OEM charger or camera body before the first shoot. Some Cullmann camera BMS systems need one complete in-body charge cycle to map the new cell's discharge curve and display remaining charge accurately.

Battery percentage jumping erratically on the Cullmann display after fitting a new cell

Ni-MH cells have a flatter discharge curve than lithium chemistries. The camera's fuel gauge is calibrated against a known discharge curve, and a fresh replacement cell can map differently until the BMS has logged a full cycle. This mismatch shows up as the percentage indicator jumping — sometimes from 80% to 20% without warning. Run one complete charge-to-discharge cycle through the camera body. After that cycle, the indicator typically stabilises and tracks remaining charge accurately.

Camera body showing a dead battery indicator on a partially charged replacement cell

Some Cullmann camera bodies apply a voltage threshold check at startup and can flag a new cell as depleted if it ships in a partially discharged state. This is a BMS voltage-floor check, not a fault with the cell. Charge the battery fully in the OEM charger before inserting it — most cells need to reach at least 7.2V open-circuit before the camera body clears the low-battery flag. Once a full charge is completed, re-insert the cell and power the camera on again.