Fischer 98100089 Emergency Light Replacement Battery 3.6V 2000mAh

Fischer AP-0360-0100-AA-NC-01 — 3.6V Ni-MH Replacement Battery (98100089)

This is a 3.6V, 2000mAh Ni-MH cell for the Fischer AP-0360-0100-AA-NC-01 emergency lighting unit. It replaces OEM part 98100089 directly. Fit the correct voltage and chemistry here — emergency lighting charge controllers are calibrated to Ni-MH float curves, and substituting a different chemistry will damage the controller or prevent a full charge.

• AP-0360-0100-AA-NC-01 fitment: This unit uses a dedicated charge rail tuned to Ni-MH voltage thresholds. The 3.6V nominal matches the controller's cut-in and float set points. A cell outside that window will either never leave bulk charge or trip the fault LED permanently.
• Bench tested on actual hardware: We ran this cell through charge acceptance and load cycling on an emergency lighting test rig. The BMS accepted the cell without fault on first insertion, and the charge indicator moved to float within the expected window at ambient temperature.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This lets the charge controller register the new cell capacity and confirms the cell accepts load before your next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-MH cell shipped from storage carries a partial state of charge — typically 40–60% of rated capacity. The charge controller in the AP-0360-0100-AA-NC-01 needs at least one full charge-discharge cycle before the cell delivers its rated 2000mAh under load. Running the duration test too soon after fitting is the most common reason for a compliance failure that isn't actually a faulty cell. Allow a full 24-hour charge period first, then run the test button for the complete rated duration to confirm pass.

Charge indicator staying red after new battery installation

The AP-0360-0100-AA-NC-01 charge controller checks cell voltage before accepting a new battery into float charge. A cell resting below the controller's float acceptance threshold — common after extended warehouse storage — will hold the indicator red as the controller treats it as a deep-discharged or faulty cell. This is not a defective battery. Leave the fitting connected to mains for 24 hours; the controller's recovery charge cycle will bring the cell voltage up into the acceptance window. If the indicator has not moved to green after 48 hours, measure cell voltage at the terminals — it should read above 3.3V.