Schneider MGN9015 Emergency Light Compatible Battery 3.6V 2000mAh

Schneider 758005 / OVA58910 Series — 3.6V Ni-Cd Replacement Battery (MGN9015)

This is a 3.6V, 2000mAh Ni-Cd cell replacing the MGN9015 in Schneider emergency lighting units. It fits models 758005, 802327, 805566, and OVA58910, among others. These units provide backup illumination for evacuation routes when mains power fails.

• Cross-model fitment — 758005, 802327, 805566, OVA58910: These fittings share the same charge controller circuit, cell voltage range, and connector format. The MGN9015 cell specification is common across the range, so one replacement SKU covers all listed models without modification.
• Bench tested on actual hardware: We ran this cell through a full charge and load cycle on a 758005 fitting. The charge controller accepted the cell without fault, the float charge stabilised correctly, and the BMS held voltage through a sustained discharge test.
• First-cycle conditioning on Ni-Cd fittings: Ni-Cd cells shipped in storage can arrive with partial or uneven charge across internal plates. Run a manual test cycle within 24 hours of installation — hold the test button for the full rated duration. This lets the charge controller register the new cell and primes the plates before your next scheduled compliance check.

Charge indicator staying red after new MGN9015 installation

Schneider emergency fittings use a float-charge controller that checks incoming cell voltage before switching to charge mode. A cell that has self-discharged in storage may sit below the float acceptance window — typically around 3.0V — and the controller reads it as a fault rather than a dischargeable cell. In most cases the controller will recover once the cell voltage climbs into the acceptance window after a short trickle period. If the red indicator persists beyond 48 hours, check terminal contact pressure and confirm the cell is seated fully in the cradle.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-Cd cell often cannot deliver full rated capacity on the first test because the plates have not yet been fully conditioned. This is not a faulty cell — it is a known characteristic of Ni-Cd chemistry after storage. Allow the fitting to charge for at least 24 hours, then run one complete manual test cycle before the formal compliance test. After that conditioning cycle, the cell should sustain output through the full rated duration.