Cooper LPZ70RWH Emergency Light Replacement Battery 3.6V 1800mAh

Cooper LPZ70RWH — 3.6V Ni-MH Replacement Battery (CUSTOM-93)

This is a 3.6V, 1800mAh Ni-MH replacement battery for the Cooper LPZ70RWH emergency lighting unit. It slots into the fitting and restores backup illumination capability after the original cell degrades or fails. Voltage and capacity match the OEM specification exactly as listed in Cooper's service documentation for this unit.

• LPZ70RWH fitting compatibility: The LPZ70RWH charge controller runs a fixed trickle charge rail tuned to 3.6V Ni-MH chemistry. Swapping to a different voltage or chemistry disrupts the charge cycle and can trigger a permanent fault condition on the controller board.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the bench. The BMS accepted the cell without fault, held float charge correctly, and the charge indicator moved from red to green within the expected window.
• First test cycle after installation: Within 24 hours of fitting this battery, hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity and confirms the cell accepts load — critical before any scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A new Ni-MH cell ships in a partially discharged state after months in storage. The LPZ70RWH charge controller begins trickle charging immediately on installation, but the cell needs at least one full charge cycle before it reaches rated capacity. Running a duration test too early means the cell cuts out before the required period ends — not a fault with the battery itself. Allow 24 hours on charge after installation, then run the test to confirm full duration.

Charge indicator staying red after new battery installation

The LPZ70RWH charge controller checks cell voltage at startup and compares it against a float acceptance window. A cell sitting in a warehouse for several months can drop below that threshold, causing the controller to hold the fault state rather than enter normal charge mode. This is not a wiring fault or a dead cell. Leave the fitting powered for four to six hours — once cell voltage climbs past approximately 3.2V, the controller exits fault mode and the indicator shifts to green.