About this replacement
URA 130040 Series — 2.4V Ni-Cd Replacement Battery (MGN0225)
This is a 2.4V, 4000mAh Ni-Cd replacement cell for URA emergency lighting units. It fits the 130040, 131199, 137971, and 615857 series fittings, along with two additional URA models. When mains power fails, this cell powers the lamp circuit to maintain illumination for evacuation.
- Multi-model URA compatibility: These fittings share the same 2.4V dual-cell Ni-Cd architecture, charge controller float voltage, and physical connector format — so one cell pack covers all listed models without modification.
- Bench tested on actual hardware: We ran this cell through a full charge cycle on the URA charge controller. The BMS accepted charge within expected parameters, and the cell held load across the full test duration without voltage collapse.
- First-cycle test requirement: Within 24 hours of installation, hold the test button for the full rated duration. This confirms the cell accepts load and lets the charge controller register the new cell capacity 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 charge. The charge controller in URA fittings applies a trickle float — it does not fast-charge a depleted cell to rated capacity in minutes. If you test within a few hours of installation, the cell will not have enough stored energy to sustain the lamp for the full rated period. Allow a minimum 24-hour charge before conducting any formal duration test. Most URA fittings need the cell sitting at float for at least that period before the charge controller logs the cell as ready.
Charge indicator staying red after confirmed correct installation
URA charge controllers compare incoming cell voltage against a float acceptance window. A cell that has self-discharged in storage below approximately 1.9V per sub-cell may sit outside that window on first connection, causing the fault or charging LED to stay red. The controller is not faulty — it is waiting for cell voltage to rise into range. Leave the fitting powered for several hours; most URA controllers will begin normal float charge once the cell climbs above the 2.0V threshold. If the red LED persists beyond 12 hours, confirm the connector is fully seated and the cell terminals are making clean contact.