Day-Brite A15032-1 Emergency Light Replacement Battery 4.8V 2000mAh

Day-Brite A15032-1 / CXL6VBXT / CXXL3GW — 4.8V Ni-MH Replacement Battery

This is a 4.8V, 2000mAh Ni-MH replacement battery for Day-Brite emergency lighting units including the A15032-1, CXL6VBXT, and CXXL3GW. It sits inside the fitting and powers the lamp circuit when mains supply drops. The cell pack matches the original form factor at 50.30 x 28.50 x 28.50mm so it seats correctly in the battery compartment.

• A15032-1, CXL6VBXT, and CXXL3GW compatibility: These three Day-Brite fittings share the same 4.8V NiMH cell configuration and battery compartment dimensions. The charge controller in each unit expects a four-cell pack at this voltage — swapping to a different cell count trips a fault state on the charge circuit.
• Bench tested on actual hardware: We ran this pack through a full charge-discharge cycle on a 4.8V NiMH charge controller. The BMS accepted charge without voltage fault, held load through the duration test window, and recovered cleanly from the deep-discharge state that long-stored emergency batteries often arrive in.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This confirms the new cell accepts load under real conditions and gives the charge controller enough data to register the new pack's capacity before the next scheduled compliance test.

Charge indicator staying red after new battery installation

Day-Brite charge controllers check incoming cell voltage before switching to float charge. A replacement pack that shipped low — typically under 4.0V on a 4.8V four-cell pack — sits outside the controller's float acceptance window and keeps the fault LED red. The fix is to let the unit trickle charge for a full 24-hour period undisturbed. At that point the cell voltage should sit at or above 4.8V and the indicator shifts to green.

Emergency light dims partway through a duration test

A new pack that has not gone through one full charge-discharge cycle has not yet reached rated capacity — 2000mAh is the conditioned figure, not the out-of-box figure. Under load the voltage sags early and the lamp dims or cuts before the test window closes. Run one complete manual test cycle within the first 24 hours, allow a full recharge, then repeat the duration test. The pack should hold steady load through the full test on the second run.