Legrand 111920 Emergency Light Compatible Battery 3.2V 600mAh

Legrand 18 148V Series — 3.2V LiFePO4 Replacement Battery (111920)

This is a 3.2V, 600mAh lithium iron phosphate cell for Legrand emergency lighting units. It fits the 18 148V, 118 149V, 118 118V, and 118 119V fittings, among others. The OEM part numbers 111920, 30016949, and HB00118TA all cross-reference this same cell.

• 18 148V and 118-series compatibility: These fittings share the same charge controller circuit, cell footprint (53 × 14.5 × 14.3mm), and float voltage profile. The BMS expects a LiFePO4 cell at 3.2V nominal — swapping in a different chemistry trips the fault LED.
• Bench tested on actual hardware: We ran this cell through the charge controller on a 118 149V fitting. The controller accepted the cell within minutes, moved from bulk to float charge without a fault flag, and the load test drew current cleanly through the full duration.
• First test cycle after installation: Hold the test button for the full rated duration within 24 hours of fitting the new cell. This lets the charge controller register the new cell's capacity before any scheduled compliance test. Skipping this step can cause a false short-duration result on your next inspection.

Charge indicator staying red after fitting this cell

LiFePO4 cells lose voltage during storage. If a cell ships at 2.8V or lower, some Legrand charge controllers sit in a pre-charge hold state and keep the LED red. This is not a fault — the controller is running a low-current recovery charge before it opens the main charge path. Give the fitting 4–6 hours on mains power. Once the cell climbs above 3.0V, the controller shifts to normal charge and the LED moves to amber or green.

Emergency light dims noticeably partway through a duration test

A freshly installed cell that has not completed one full conditioning cycle will not deliver its rated 600mAh on the first activation. The charge controller has not yet mapped the cell's full capacity, so it underestimates state of charge and the fitting dims under load before the test window closes. Run one complete manual test cycle — discharge to cutoff, then allow a full recharge on mains — before the fitting goes back into a compliance rotation. After that cycle, output holds steady across the duration.