Ceag 40071353667 Emergency Lighting Replacement Battery 3.7V 5200mAh

Ceag (40071353667) — 3.7V Li-ion Replacement Battery

This is a 3.7V, 5200mAh Li-ion replacement cell for Ceag emergency lighting fittings that carry OEM part number 40071353667. It restores backup illumination function when the original cell has degraded past the point of passing a duration test. Ceag fittings using this cell are typically found in commercial buildings where maintained and non-maintained exit lighting must meet scheduled compliance intervals.

• Ceag emergency lighting platform: Fittings using part 40071353667 share a single-cell 3.7V architecture with a charge controller that floats the cell at a fixed voltage. Any replacement must match the OEM voltage and physical dimensions exactly — 66.50 × 37.10 × 19.20mm — or the connector and housing will not seat correctly.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and then a load discharge test. The BMS accepted charge without flagging an over-voltage fault, and the cell held stable output under the simulated lighting load through the full test 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 current and lets the charge controller log the new cell capacity before the next scheduled compliance inspection.

Charge indicator staying red after new battery installation

Ceag charge controllers use a float acceptance window to confirm the cell is charging normally. A replacement cell that has been in storage may arrive at a lower resting voltage than the controller expects at the start of a charge cycle. When the cell voltage falls outside that window, the controller holds a fault state and keeps the indicator red. Leave the fitting powered on the mains for a full 24-hour charge before concluding there is a fault. If the indicator has not moved to green after 24 hours, check cell voltage at the connector — it should read at or above 3.0V before the controller will accept it.

Emergency light dims partway through a duration test

This happens when the cell has not completed a full conditioning charge before the test begins. A freshly installed cell pulled straight into a duration test may not have reached its full 5200mAh charge state, so output voltage drops under load sooner than the rated duration allows. The fix is straightforward — allow at least 24 hours of uninterrupted mains charging after installation before running any timed duration test. If dimming still occurs after a full charge, measure open-circuit cell voltage; it should sit at or above 4.1V before a duration test is valid.