Kaufel 850.0011 Emergency Light Replacement Battery 12V 8000mAh

Kaufel 850.0011 — 12V Ni-CD Replacement Battery (BGN7000-10FWP-T)

This is a 12V, 8000mAh nickel-cadmium replacement battery for the Kaufel 850.0011 emergency lighting unit. It replaces OEM part BGN7000-10FWP-T. The cell supplies backup illumination during mains failure and must hold its rated charge to pass compliance duration tests.

• Kaufel 850.0011 and 850-0011 fitment: Both model numbers refer to the same Kaufel emergency lighting unit. The connector, cell block dimensions (178.20 × 92.00 × 61.10mm), and charge controller voltage window are identical across the run, so one part number covers both.
• Bench tested on actual hardware: We cycled this cell through a full charge and load discharge on the 850.0011 charge controller. The BMS accepted the cell without fault, and the float charge stabilised at the correct terminal voltage. No false fault LED was triggered during the test.
• First installation test cycle: Within 24 hours of installation, hold the test button for the full rated duration. Ni-CD cells shipped in storage may not reach full rated capacity on the first activation. Running one complete test cycle lets the charge controller register the new cell and conditions it before your next scheduled compliance inspection.

Why the 850.0011 charge indicator stays red after a new battery is fitted

Ni-CD cells lose voltage during extended storage. If the open-circuit voltage drops too low, the 850.0011 charge controller may hold a fault or charge-inhibit state rather than entering normal float charge. The controller expects the incoming cell to sit within a specific acceptance window before it transitions to green. Leaving the fitting powered for 12–24 hours usually allows the controller to complete its re-initialisation cycle and clear the red indicator. If it does not clear after 24 hours, check that terminal voltage at the battery connector reads at least 10.5V.

Emergency light dims and cuts short during a duration test after replacement

A cell that has not completed a full conditioning charge will appear functional at rest but sag under load within the first few minutes of a test. This is not a faulty cell — it is an undercharged one. Ni-CD chemistry requires at least one full charge cycle from a depleted state to reach rated capacity. Allow a minimum of 24 hours on charge before running any duration test. If dimming still occurs after that charge period, confirm the charge controller output is reaching the battery terminals rather than dropping across a corroded connector.