Kaufel 002150 Emergency Light Replacement Battery 6V 4000mAh

Kaufel 002150 / 002003E Series — 6V Ni-CD Replacement Battery (BGN5500-5DWP-A800EC)

This is a 6V 4000mAh nickel-cadmium replacement cell for Kaufel emergency lighting fittings, including models 002150, 002003E, 002169, and C2. It slots directly into fittings that use OEM part BGN5500-5DWP-A800EC. Capacity is rated at 24Wh — use that figure when calculating compliance test duration expectations.

• Model group compatibility: The 002150, 002003E, 002169, and C2 fittings share the same 6V cell bay, connector orientation, and trickle charge circuit. Swapping between these models does not require wiring changes — the BMS logic in each fitting reads cell voltage the same way.
• Bench tested on actual hardware: We cycled this cell through a full charge, then triggered a simulated mains-loss event. The BMS accepted the cell without fault codes, and the output voltage held within expected range through the full discharge curve.
• First-installation test requirement: Perform a manual test cycle within 24 hours of fitting the new cell — hold the test button for the full rated duration. This lets the charge controller register the new cell before your next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-CD cell rarely ships at full capacity. Storage and transit self-discharge can drop the cell to 30–50% of rated charge before it ever enters the fitting. The Kaufel charge controller tops the cell up via trickle charge, but that process takes up to 24 hours from a low state. Running a compliance duration test before that window closes will almost always produce a short result — not because the cell is faulty, but because it hasn't completed its first full charge cycle. Allow one full charge period, then retest.

Charge indicator staying red after new cell installation

Some Kaufel fittings require the cell voltage to sit within a narrow acceptance window before the charge circuit switches from bulk to float and the indicator turns green. A cell that arrives below roughly 5.4V may cause the controller to flag a fault rather than begin charging. Remove the cell, leave it disconnected for two minutes, then reinstall — this forces the controller to re-read cell voltage from scratch. If the indicator stays red beyond 48 hours of normal mains supply, measure cell voltage directly; it should be climbing toward 7.2–7.5V under trickle charge.