Kaufel 758208 Emergency Light Replacement Battery 3.6V 2000mAh

Kaufel 758208 / F734S0366 / F734S0367 — 3.6V Ni-CD Replacement Battery

This is a 3.6V, 2000mAh nickel-cadmium cell for Kaufel emergency lighting units including models 758208, F734S0366, F734S0367, and 226 610. It replaces the internal battery that powers the fitting during a mains failure. Chemistry and voltage match the original charge controller requirements exactly.

• Multi-model fit across the Kaufel range: These fittings share the same 3.6V single-cell NiCd architecture and physical cell format — 130 × 22.5 × 22.5mm — so one cell serves across the listed models without wiring modifications.
• Bench tested on actual hardware: We ran this cell through a charge cycle on a compatible Kaufel fitting and confirmed the charge controller moved from red to green within the expected window. BMS handshake completed without fault flags.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity and clears any stored fault state before your next scheduled compliance test.

Emergency light failing its duration test after battery replacement

A freshly installed NiCd cell ships at partial state of charge — typically between 30% and 60%. The charge controller in most Kaufel fittings applies a float or trickle charge that can take 18–24 hours to bring the cell to full capacity. Running a duration test before that window closes means the cell exhausts early, not because it is faulty, but because it was not fully charged. Allow a full 24-hour charge before any compliance test and the rated duration is achievable.

Charge indicator staying red after new battery installation

Some Kaufel fittings latch a fault condition in the controller logic when the old cell drops below the float acceptance threshold — typically around 3.2V or lower. Swapping the cell alone does not always clear this flag. On most units, holding the test button for three to five seconds after installation triggers a manual reset and allows the controller to re-evaluate the new cell voltage. If the LED remains red after that, check the cell connector seating — a marginal contact reads as an open circuit to the charge controller.