Mica Halogen Y216F Emergency Light Replacement Battery 6V 4000mAh

Mica Halogen Y216F / MY0837F — 6V Ni-Cd Replacement Battery (30059216.00)

This is a 6V, 4000mAh Ni-Cd rechargeable battery for the Mica Halogen Y216F and MY0837F emergency lighting units. It replaces OEM part 30059216.00 when the original cell can no longer hold charge or fails a duration test. Voltage and capacity match the factory spec directly from Mica's product data.

• Y216F and MY0837F platform: Both fittings share the same 6V charge rail, cell footprint, and connector pinout — which is why a single cell covers both models. The charge controller in each fitting expects a Ni-Cd chemistry response during float; substituting a different chemistry will cause the charge indicator to misread state of charge.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and applied a load test. The BMS accepted the cell without a fault flag, and the charge indicator transitioned from red to green within the expected window after the cell voltage rose past the float acceptance threshold.
• First-cycle test requirement: Within 24 hours of installation, hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity and prevents a false failure on your next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-Cd cell does not arrive at full capacity — storage and shipping leave it partially discharged. The charge controller needs at least one complete charge cycle before the cell can deliver its rated 4000mAh under load. If you run a duration test too soon, the light will dim or cut out early, and the fitting logs a fail. Allow the unit to charge uninterrupted for 24 hours, then run the full test cycle from the test button before logging results for compliance.

Charge indicator staying red after new battery installation

The charge controller in these Mica fittings reads cell voltage to decide whether to accept the new cell into float charge. A cell that has sat in a warehouse drops below the float acceptance window — typically under 5.4V for a 6V Ni-Cd pack — and the controller holds the fault state rather than switching to charge mode. Measure the cell terminal voltage with a multimeter; if it reads below 5.4V, apply a slow external charge at the correct Ni-Cd rate until it reaches approximately 6V, then reinstall. The charge indicator should transition to green within a few hours once the controller sees a voltage it can work with.