Exit Light Co ELR-G Replacement Battery 4.8V 1500mAh NiMH

Exit Light Co ELR-G / ELR-R Series — 4.8V Ni-MH Replacement Battery (BAA-48R)

This is a 4.8V, 1500mAh Ni-MH cell pack replacing the BAA-48R battery in Exit Light Co emergency exit fixtures. It fits the ELR-G, ELR-R, LEDG3B, LEDGBB, and related models in this range. Voltage and cell count match the original so the onboard charge controller operates within its normal float parameters.

• ELR and LED series compatibility: These fixtures share a 4.8V four-cell NiMH architecture and the same connector footprint. The charge controller in each model runs a constant-current float topped at roughly 5.5V — this cell pack sits within that acceptance window without triggering a fault state.
• Bench tested on actual hardware: We cycled this pack through a full discharge-to-cutoff and back to float charge. The BMS registered charge acceptance within 20 minutes of connection and held a stable float current through a complete 90-minute rated duration run.
• First-cycle load confirmation: Within 24 hours of installation, hold the test button for the full rated duration. This confirms the new cell accepts load under real conditions and lets the charge controller register actual capacity before any scheduled compliance test counts against the fitting.

Emergency light failing its duration test after battery replacement

A freshly installed NiMH pack that has been in storage will not deliver full rated capacity on its first activation. The cells need at least one complete charge-discharge cycle to reach the 1500mAh figure stamped on the label. If a compliance test runs before that first conditioning cycle completes, the light will cut out early and log a failure. Run a manual test cycle immediately after installation — do not wait for the scheduled test to serve as the first discharge.

Charge indicator staying red after new battery installation

Some Exit Light Co fittings latch a fault LED when cell voltage drops below the float acceptance threshold during storage — this is a controller state, not a cell defect. The charge circuit needs to see the pack voltage climb above approximately 4.2V before it exits fault mode and switches the indicator to green. Leave the fitting on mains power for a full 24-hour charge cycle before concluding there is a wiring or cell fault. If the indicator remains red after 24 hours, disconnect and reseat the connector to rule out a floating contact.