Ceag Emergency Light Compatible Battery 3.7V 2600mAh

Ceag Emergency Light — 3.7V Li-ion Replacement Battery (40071353666)

This 3.7V 2600mAh Li-ion cell replaces the OEM battery in Ceag emergency and safety lighting units. It fits fittings referencing part numbers 40071353666 and 40071353398. Swap it in when the unit fails its duration test or the charge indicator stays red after a sustained mains supply.

• Emergency Light and Safety Light compatibility: Both fitting types share the same 3.7V single-cell architecture, connector pinout, and charge controller float voltage. One cell works across both variants — confirm the OEM part number on the label inside the fitting before ordering.
• Bench tested on actual hardware: We cycled this cell through a full charge and timed discharge on a 3.7V single-cell test rig. The BMS accepted charge without interruption, voltage held stable under load, and the cell reached rated capacity by the second full cycle.
• First-cycle test requirement for compliance: Run a full manual duration test within 24 hours of installation. Hold the test button for the complete rated period. This lets the charge controller register the new cell's capacity and clears any fault state before the next scheduled compliance check.

Charge indicator staying red after new battery installation

Ceag fittings use a float-charge controller that checks incoming cell voltage before switching to the green charge state. A new cell stored for several months can sit below the float acceptance window — typically around 3.5V — which the controller reads as a fault rather than a depleted cell. The controller will not step up to fast charge from that state. Leave the fitting on mains for 12 to 24 hours; the trickle pre-charge stage will bring the cell above the acceptance threshold and the indicator will shift to green.

Emergency light failing its duration test after battery replacement

A freshly installed cell has not yet gone through a full charge-discharge cycle, so its usable capacity on the first test is lower than its rated 2600mAh. The fitting's lamp driver draws a fixed current, and a partially conditioned cell hits the low-voltage cutoff sooner than a broken-in one. This is not a faulty cell — it is a conditioning issue. Allow one complete charge cycle after installation, then rerun the duration test; the cell should hold the lamp load for the full rated period at that point.