Schneider TD110332 Emergency Light Compatible Battery 3.6V 4000mAh

Schneider OVA51028E Series — 3.6V Ni-CD Replacement Battery (TD110332)

This is a 3.6V, 4000mAh Ni-CD replacement battery for the Schneider OVA51028E emergency lighting unit. It also fits the OVA Bargellini, Everlux Ferro, and EVX Ferro fittings that share the same cell format and charge controller interface. OEM part numbers TD110332 and 329056000 both cross-reference to this cell.

• OVA51028E, OVA Bargellini, Everlux Ferro, EVX Ferro compatibility: These fittings share a common charge controller voltage threshold and the same physical cell format — 180.20 × 35.40 × 32.70mm. The BMS float acceptance window is identical across the range, so one cell covers all four.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and simulated mains failure. The charge controller accepted the cell without fault, and the BMS held voltage through the load test without dropping below the controller's cutoff threshold.
• First-cycle activation on emergency fittings: Hold the test button for the full rated duration within 24 hours of installation. This lets the charge controller register the new cell capacity and confirms the cell accepts load before your next scheduled compliance test.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-CD cell ships in a partially discharged state after storage. The charge controller in the OVA51028E fitting begins topping it up immediately, but a full conditioning charge takes up to 24 hours. If a duration test runs before the cell reaches full charge, the light will cut out early — this is not a faulty cell. Run one complete manual test cycle after 24 hours on charge, then re-submit for your compliance test. The cell should hold the rated duration once fully conditioned.

Charge indicator staying red after new battery installation

The OVA51028E charge controller checks cell voltage at the float acceptance window during initialisation. A cell that has sat in storage drops below this window, so the controller flags a fault and holds the red LED rather than transitioning to green. Leave the fitting on mains power for a full charge cycle — typically 24 hours. If the LED does not shift to green after that period, press and hold the reset button on the fitting to force the controller to re-poll the cell voltage at 3.6V nominal.