RZB 671817.009 Emergency Lighting Replacement Battery 2.4V 2000mAh

RZB 671817.009 — 2.4V Ni-CD Replacement Battery (671817.009)

This is a 2.4V 2000mAh Ni-CD replacement cell for RZB emergency lighting fixtures using part number 671817.009. It fits the 671817.009 fitting directly and restores backup illumination function during mains failure events. Cross-references 98100103 and 663-0088-20.01 42-2014 confirm compatibility across the same RZB fitting family.

• 671817.009 fitting family: These fittings share a common charge controller voltage rail at 2.4V and use the same physical cell format — 86 x 26 x 22.60mm. Swapping in a mismatched voltage cell trips the charge controller into a fault state and prevents float charge from completing.
• Bench tested on actual hardware: We ran the cell through a full charge cycle and applied a load discharge to simulate a duration test. The BMS accepted the cell without a fault flag, and voltage held above the low-cutoff threshold throughout the full discharge curve.
• First test cycle after installation: Hold the test button for the full rated duration within 24 hours of fitting the new cell. Ni-CD cells shipped in storage discharge partially — this first manual cycle lets the charge controller register actual cell capacity before your next scheduled compliance test.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-CD cell does not arrive at full capacity — storage discharge means the cell may hold only 60–70% on day one. If the fitting goes straight into a compliance duration test before a conditioning charge cycle, the cell will drop below cutoff before the rated duration completes. Allow the fitting a full 24-hour mains charge after installation before running any duration test. One complete charge-discharge cycle brings the cell to its rated 2000mAh and the test will pass at rated duration.

Charge indicator staying red after new cell installation

The charge controller on these RZB fittings uses a float acceptance window — if the incoming cell voltage sits outside that window after storage, the controller holds a fault state and the indicator stays red. This is not a wiring fault or a dead cell. Remove mains power for 30 seconds to reset the controller, then restore power. The controller re-polls the cell voltage on restart and will begin float charge if the cell reads within the 2.4V acceptance band.