Lithonia ELB-B003 Compatible Battery 9.6V 1800mAh Ni-MH

Lithonia ELB B003 / ELB B004 — 9.6V Ni-MH Replacement Battery (ELB-B003)

This is a 9.6V 1800mAh Ni-MH replacement battery for Lithonia ELB B003 and ELB B004 emergency lighting units. It restores backup illumination capability after the original cell has degraded below the charge threshold needed to sustain a full duration test. Voltage and physical dimensions match the factory cell exactly: 200.30 × 28.90 × 14.60mm.

• ELB B003 and ELB B004 compatibility: Both models share the same 9.6V charge circuit, connector pinout, and cell bay dimensions. The charge controller does not distinguish between the two — same float voltage, same BMS handshake window.
• Bench tested on actual hardware: We ran the cell through a full load cycle on the ELB charge circuit. The controller accepted the new cell within the expected float voltage window and advanced to green status without manual intervention after a full conditioning charge.
• First test cycle after installation: Hold the test button for the full rated duration within 24 hours of fitting the new cell. This confirms the cell accepts load under real conditions and allows the charge controller to register available capacity before any scheduled compliance inspection.

Charge indicator staying red after new battery installation

A Ni-MH cell shipped in a partially discharged state may sit outside the float acceptance window that the ELB charge controller expects on first contact. The controller reads incoming cell voltage and will not transition from charge to float — so the red indicator holds — until the cell climbs into the 10.2–10.8V range under trickle charge. Leave the fitting powered for a full 24-hour charge cycle before assuming a fault. If the indicator has not shifted to green after 24 hours with confirmed mains power, check the connector seating and verify supply voltage at the fitting terminal.

Emergency light dims and cuts out partway through a duration test

This happens when the replacement cell has not completed a full conditioning charge before the test button is held. An under-charged Ni-MH pack delivers rated current initially, then voltage collapses as surface charge depletes — the fitting's low-voltage cutoff trips and the lamp drops out. It is not a faulty cell. Allow a minimum 24-hour charge before running any duration test. If dimming repeats after a full charge cycle, measure open-circuit cell voltage: a good cell should read at least 9.8V before load is applied.