About this replacement
Kaufel 850.0061 — 6V 2000mAh Ni-MH Replacement Battery (850.0061)
This 6V 2000mAh Ni-MH battery replaces the cell in the Kaufel 850.0061 emergency lighting fitting. It powers the fitting's backup illumination during mains failure events. Voltage and capacity match the original spec exactly — 6V, 2000mAh, 12Wh.
- Kaufel 850.0061 fitting compatibility: The 850.0061 fitting uses a dedicated charge controller calibrated for a 6V Ni-MH cell at this capacity. Swapping chemistry or voltage causes the controller to misread charge state and flag a fault. This cell keeps the charge rail at the voltage the controller expects.
- Bench tested on actual hardware: We cycled this cell through full charge and timed discharge on the 850.0061 fitting. The BMS accepted the cell without fault codes, and the charge indicator moved from red to green within the expected window.
- First-cycle activation on Kaufel fittings: After fitting, hold the test button for the full rated duration within 24 hours of installation. This lets the charge controller register actual cell capacity and clears any residual fault state from storage voltage before your next scheduled compliance test.
Charge indicator staying red after fitting the new cell
Ni-MH cells lose voltage during storage. If a cell ships at low resting voltage, the Kaufel 850.0061 charge controller sits outside its float acceptance window and holds the fault LED red rather than beginning a normal charge cycle. This is not a faulty cell — it is a voltage threshold condition. Leave the fitting on mains power for 12 to 24 hours; the controller will detect rising cell voltage and transition to normal charge mode. If the LED has not shifted to green after 24 hours, confirm mains supply to the fitting is live and the cell connector is fully seated.
Emergency light fails its duration test after battery replacement
A freshly installed cell has not yet completed a full charge cycle, so its usable capacity at the point of a duration test is lower than rated. The fitting dims or cuts out before the test period ends — this is not a defective cell. Run one full manual test cycle immediately after installation: charge for a minimum of 24 hours, then hold the test button through the complete rated duration. That single cycle conditions the cell and allows the controller to record accurate capacity data ahead of any formal compliance inspection.