Inotec 890021 Emergency Light Replacement Battery 4.8V 2000mAh

Inotec 890021 — 4.8V Ni-MH Replacement Battery (98100110)

This is a 4.8V, 2000mAh Ni-MH replacement battery for the Inotec 890021 emergency lighting unit. It uses OEM part number 98100110 and slots directly into the fitting. When mains power drops, this cell activates the emergency light to maintain visibility for evacuation.

• Inotec 890021 emergency lighting platform: The 890021 fitting runs a 4.8V cell stack with a trickle charge controller that floats the battery between tests. Voltage, cell count, and connector format must match the original — a mismatched cell count shifts the float voltage and can trigger a permanent fault LED.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and simulated a mains-loss event on the bench. The BMS accepted the charge without triggering an overcharge cutoff, and the cell held stable output voltage through the load test duration.
• First-cycle activation on emergency fittings: Hold the test button for the full rated duration within 24 hours of installation. This confirms the new cell accepts load under real conditions and lets the charge controller register the new cell capacity before any scheduled compliance test.

Charge indicator staying red after new battery installation

The 890021 charge controller checks cell voltage when the new battery is first connected. A cell that has self-discharged during storage may sit below the float acceptance window — typically around 4.5V for a 4.8V Ni-MH pack — which the controller reads as a fault rather than a dischargeable cell. Leave the fitting on mains power for 24 hours. Most controllers will begin trickle charging once the cell voltage edges above the acceptance threshold and will shift to green within one full charge cycle.

Emergency light passing installation check but failing the duration test

A new Ni-MH cell does not reach rated capacity on its first activation — factory storage partially depletes the cell and the first discharge cycle is typically shorter than rated. One full charge-discharge cycle conditions the cell and allows it to reach the 2000mAh specification. Run a manual test cycle immediately after installation, let the fitting recharge fully on mains for at least 24 hours, then retest. The duration should meet compliance requirements on the second test cycle.