Lithonia EU2LED Emergency Light Replacement Battery 3.6V 800mAh

Lithonia EU2LED Series — 3.6V Ni-CD Replacement Battery (ELB-B001)

This is a 3.6V, 800mAh Ni-CD replacement battery for the Lithonia EU2LED, EU2 LED, and IPP-700AA emergency lighting units. It slots into the fixture housing and provides backup illumination when mains power fails. Capacity is 2.88Wh, matching the original cell specification.

• EU2LED, EU2 LED, and IPP-700AA compatibility: These units share the same 3.6V three-cell Ni-CD pack format, connector pin-out, and charge controller float voltage. The ELB-B001 part number covers all three variants — the charge controller does not distinguish between them at the hardware level.
• Bench tested on actual hardware: We cycled this cell through a full charge-then-load sequence on the EU2LED board. The charge controller accepted the cell without fault, moved from charge to float at the expected voltage, and the LED array activated cleanly on simulated mains failure.
• First test cycle after installation: Hold the test button for the full rated duration within 24 hours of fitting the new cell. This forces the charge controller to register the new cell's capacity before any scheduled compliance test runs. Skip this step and the first automated test may log a duration fault against a cell that is actually good.

Charge indicator staying red after fitting the ELB-B001

A Ni-CD cell sitting in a warehouse for months arrives with a resting voltage below the EU2LED charge controller's float acceptance window. The controller reads this as a suspect or faulty cell and holds the red charge indicator rather than progressing to green. This is not a defective battery — it is a low-state-of-charge cell that needs a full charge cycle to bring voltage into the acceptance range. Leave the fitting powered on the mains for a full 24-hour charge period before drawing any conclusion. If the indicator has not moved to green after 24 hours at mains power, check that the cell connector is fully seated and measure across the terminals — you should read at least 3.2V at that point.

Emergency light dims or cuts out partway through a duration test

This symptom points to a cell that has not completed its first conditioning cycle, not a capacity defect. Ni-CD cells that have been stored in a partially discharged state can deliver lower-than-rated capacity on the first discharge — they recover on subsequent cycles. Run one complete charge-discharge-recharge cycle manually using the test button before the compliance test date. After that conditioning cycle, the cell should hold voltage above the LED driver's cutoff threshold for the full rated duration. If dimming still occurs after two full cycles, measure resting voltage after a 24-hour charge — a healthy cell should read 4.2–4.5V across the pack at float.