PowerSonic A19390-2 Emergency Light Replacement Battery 6V 5000mAh

PowerSonic A19390-2 — 6V Ni-MH Replacement Battery (BGN5500-5FWP-A800EC)

This is a 6V, 5000mAh Ni-MH replacement battery for the PowerSonic A19390-2 emergency lighting unit. It fits directly into the A19390-2 fitting and restores backup illumination during mains failure. Dimensions are 97.50 x 61.60 x 63.70mm — confirm clearance inside the housing before installation.

• A19390-2 compatibility: The A19390-2 uses a 6V Ni-MH cell with a specific capacity threshold that the charge controller checks against. This cell matches the voltage rail and connector orientation, and the 5000mAh rating keeps the charge controller within its acceptance window during the initial float cycle.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and simulated mains failure to confirm the BMS accepted the cell and the fitting switched to emergency mode without fault. The cell held load across the full test duration without voltage sag triggering cutoff.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This lets the charge controller register the new cell capacity and confirms the cell accepts load before your next scheduled compliance test.

Charge indicator staying red after new battery installation

After months in storage, a Ni-MH cell arrives with a resting voltage lower than the fitting's float acceptance window. The A19390-2 charge controller interprets this low resting voltage as a fault condition and holds the red indicator. Leave the fitting powered for 12–24 hours undisturbed — the trickle charge will bring the cell voltage up into the acceptance range and the indicator will shift to green. If the red light persists past 24 hours, measure across the cell terminals; you should see at least 5.4V before the controller will register a healthy cell.

Emergency light dims partway through a duration test

A freshly installed cell that has not completed one full charge cycle will not deliver its rated capacity under load. When the fitting draws current during the test, the cell voltage drops early and the fitting dims or shuts off before the required duration is met. This is not a faulty cell — it is an uncharged one. Allow a full 24-hour charge before running any compliance test, then repeat the duration test with the cell at full charge.