PowerSonic OSA039 6V Emergency Light Replacement Battery 2200mAh

PowerSonic A13146-10 — 6V Ni-MH Replacement Battery (OSA039)

This is a 6V, 2200mAh Ni-MH replacement cell for the PowerSonic A13146-10 emergency lighting unit. It restores backup power to exit signs and emergency luminaires that rely on this fitting. The OSA039 part number matches the original cell format, voltage rail, and physical dimensions (111.20 × 44.00 × 22.50mm).

• A13146-10 compatibility: The A13146-10 fitting uses a 6V Ni-MH cell on a float-charge circuit. The charge controller expects the voltage signature and internal resistance range of a Ni-MH chemistry — substituting a different chemistry will cause the controller to misread charge state and flag a fault.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and applied a load consistent with emergency luminaire draw. The BMS accepted charge without tripping, held voltage under load, and the charge indicator advanced from red to green within the expected window.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This confirms the cell accepts load and lets the charge controller register the new cell capacity before your next scheduled compliance inspection.

Charge indicator staying red after new OSA039 installation

A fresh Ni-MH cell shipped from storage typically sits at a lower resting voltage than the float acceptance window the A13146-10 charge controller expects. The controller sees the low open-circuit voltage and holds the red indicator rather than entering float mode. This is not a fault with the cell — it resolves as the controller top-charges the battery. Allow 24–48 hours on mains power before assuming a fault; the indicator should shift to green once the cell reaches approximately 7.2V fully charged across the six internal sub-cells.

Emergency light dims and cuts short during a timed duration test

A new cell that has not completed a full conditioning cycle will not deliver its rated 2200mAh on the first discharge. The cell chemistry needs one complete charge-discharge cycle to reach full capacity — partial charges from storage do not count. If the light dims before the test duration is met, return the fitting to mains power for a full 24-hour charge, then run the test again. If it still falls short after a second full charge cycle, check the fitting's load — failed LEDs or a faulty driver will drain the cell faster than the rated draw.