GE AS3 Monitor Compact Option Replacement Battery 24V 2500mAh

GE AS3 Monitor Compact Option — 24V Ni-MH Replacement Battery (MNC784623P)

This is a 24V, 2500mAh Ni-MH replacement battery for the GE AS3 Monitor Compact Option and Datex AS-3 Monitor Compact Option. It fits the Compact AS3, Compact AS3 FLM, and related variants that share the MNC784623P form factor. It provides backup power during patient assessments when mains power is unavailable or interrupted.

• AS3 Monitor platform compatibility: These compact monitor variants share the same 24V battery bay, connector pinout, and BMS handshake protocol. The MNC784623P designation covers the full platform — the BMS reads cell chemistry and voltage via the same interface across all listed models.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the AS3 platform. The BMS accepted the new Ni-MH cell, completed its verification pass, and held charge within expected parameters across three consecutive cycles.
• Post-swap self-test protocol: After fitting this battery, let the monitor complete its full power-on self-test without interruption. The AS3 runs a BMS verification sequence at startup — cutting power during this window creates a false battery fault flag that persists until the next clean reboot cycle.

Why the AS3 Monitor alarms low battery immediately after a confirmed full charge

The AS3's BMS stores charge-acceptance thresholds calibrated to the original OEM cell's internal resistance profile. A new replacement cell has a different resistance signature on the first cycle, so the BMS can interpret a fully charged pack as below threshold. This is not a fault with the cell. Run one complete charge-discharge cycle on the device before returning it to clinical rotation — after that cycle, the BMS recalibrates and the alarm clears.

AS3 Monitor not completing boot sequence after battery replacement

If the monitor stalls mid-boot after a battery swap, the most common cause is a cell that has self-discharged below the BMS recovery threshold during storage — typically below 20V on a 24V Ni-MH pack. The BMS will not supply system power from a cell it reads as critically depleted. Connect mains power first, allow the charger to bring the cell above the recovery floor for at least 30 minutes, then attempt a cold boot. Once the cell reads above the minimum threshold, the boot sequence completes normally.