ELB 1P201N2 Lithonia Emergency Light Replacement Battery 1.2V 1200mAh

Lithonia LQM S W 3 G / LX S W 3 G Series — 1.2V Ni-Cd Replacement Battery (ELB 1P201N2)

This is a 1.2V, 1200mAh Ni-Cd cell that replaces the factory battery in Lithonia LQM S W 3 G 120/277 ELNSD and related emergency lighting fixtures. It restores the unit's ability to power the lamp head during a mains failure event. Voltage and capacity match OEM spec exactly — no modifications needed.

• LQM and LX series compatibility: These fixtures share the same charge controller circuit, cell footprint, and connector orientation. The 1.2V float charge rail and NiCd charge termination logic are identical across the LQM S W 3 G and LX S W 3 G variants, so one cell covers the full group.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the LQM platform. The charge controller reached float without triggering the fault LED, and the BMS accepted the cell from cold storage without a reset procedure.
• First test cycle after installation: Within 24 hours of fitting, press and hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity before your next scheduled compliance inspection — skipping this step can cause a failed duration reading even on a good cell.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-Cd cell ships in a partial state of charge. The charge controller in these Lithonia fixtures requires at least one full charge-discharge cycle before the cell delivers its rated capacity under load. If you run a duration test before that cycle completes, the lamp head will dim or cut off early — not because the cell is faulty, but because it hasn't been conditioned. Allow 24 hours on charge after installation, then run a full manual test. Rated capacity is available once the cell reaches 1.2V under load.

Charge indicator staying red after confirmed good installation

Storage discharge can drop a new cell's resting voltage below the float acceptance window the charge controller expects on power-up. When the controller reads a voltage below its threshold, it flags a fault and holds the red LED rather than entering charge mode. Remove mains power for 30 seconds, then restore it — this resets the charge controller and forces a fresh cell detection cycle. If the LED shifts to green within 10 minutes, the cell is charging normally and no further action is needed.