Sure-Lite 26-148 Emergency Light Replacement Battery 3.6V 1800mAh

Sure-Lite 26-148 / LPX70RWH / SL026184 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1800mAh Ni-MH replacement cell for Sure-Lite emergency lighting fixtures. It fits the 26-148, LPX70RWH, and SL026184 units — exit signs and emergency luminaires used in commercial buildings. Voltage and capacity match the original specification from the product data.

• 26-148, LPX70RWH, SL026184 compatibility: These three models share the same charge controller circuit, float voltage threshold, and cell bay dimensions — 52.45 x 43.50 x 14.68mm. A single Ni-MH cell at 3.6V satisfies all three units without modification.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on a 3.6V Ni-MH charge controller. The BMS accepted the cell without fault, reached float, and held voltage through a simulated mains-failure load event.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This puts a real load on the new cell and allows the charge controller to register actual capacity before your next scheduled compliance inspection.

Charge indicator staying red after fitting a new cell

A new Ni-MH cell shipped from storage typically sits at a lower resting voltage than the float threshold the charge controller expects. When the controller reads that low voltage, it flags an abnormal condition and holds the red indicator rather than entering normal charge mode. Leave the fitting powered for 12–24 hours without interruption. Once the cell climbs into the controller's acceptance window — usually above 3.3V under trickle — the indicator will shift to green.

Emergency light dims partway through a duration test

Dimming mid-test is not a cell fault — it is a first-cycle capacity issue. A Ni-MH cell that has not completed one full charge-discharge cycle will not deliver its rated 1800mAh from the start. The cell voltage drops under sustained load before the full charge has been worked into the cell structure. Allow the fitting to charge for a full 24 hours after installation, then run the test again. The cell should hold voltage through the complete test duration.