NavLite NNYXSB Emergency Light Compatible Battery 3.6V 1800mAh

NavLite NNYXSB / Sure-Lites LPX70RWH — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1800mAh Ni-MH replacement cell for NavLite emergency lighting units, including the NNYXSB, Sure-Lites LPX70RWH, and 026-148 fittings. These fittings provide backup illumination during mains failure and must pass timed duration tests to meet safety compliance standards. Swapping a degraded cell restores the fitting's rated backup capacity.

• NNYXSB, LPX70RWH, and 026-148 compatibility: All three fittings share the same 3.6V single-cell Ni-MH format, charge controller float voltage, and physical footprint — 52.45 × 43.50 × 14.68mm. The charge board accepts this cell without modification or adapter.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and simulated mains dropout. The BMS accepted the cell without fault, the charge indicator advanced from red to green within the expected window, and the lamp activated cleanly on simulated power loss.
• First-cycle compliance prep: Within 24 hours of installation, hold the test button for the fitting's full rated duration. This lets the charge controller register the new cell's capacity before the next scheduled compliance inspection — skipping this step can cause a false fail on the first duration test.

Charge indicator staying red after new battery installation

Emergency light charge controllers use a float-voltage window to confirm a healthy cell. A new Ni-MH cell that has been in storage can sit below the controller's acceptance threshold — typically under 3.3V — which keeps the fault or charge LED red. The controller isn't broken; it's waiting for the cell to rise into the float band. Leave the fitting on mains for 24 hours and the indicator should shift to green once the cell climbs above approximately 3.6V under float charge.

Emergency light dims and cuts short during a duration test

A new cell that hasn't completed its first full charge cycle will not deliver rated capacity under load. The charge controller may show green, but the cell has only absorbed a surface charge — not a full 1800mAh cycle. During the test, voltage sags early and the lamp dims or the fitting shuts off before the required duration elapses. Run one complete charge-then-test cycle before scheduling a formal compliance inspection, and verify terminal voltage reads at least 3.5V before starting the timed test.