Datex Ohmeda Light Monitor 893365 Replacement Battery 13.2V

Datex Ohmeda Light Monitor S/5 — 13.2V Ni-MH Replacement Battery (893365)

This is a 13.2V, 2000mAh Ni-MH replacement battery for the Datex Ohmeda Light Monitor 893365, S/5 Light Monitor, and S5 Light Monitor. These are medical-grade patient monitoring devices used in clinical environments. The battery maintains portable operation during continuous vital sign monitoring when the original cell degrades or fails.

• Ohmeda Light Monitor 893365 / S/5 platform: The S/5 and S5 Light Monitor share the same battery bay geometry, connector pinout, and 13.2V rail. All listed models accept this cell without modification to the battery compartment or charge circuit.
• Bench tested on actual hardware: We ran this cell through the Ohmeda charge circuit and confirmed the BMS accepted the cell, completed its handshake, and held charge without triggering a fault condition. Discharge curve tracked expected Ni-MH behaviour across the full load cycle.
• Power-on self-test protocol: After installing this battery, allow the monitor to complete its full power-on self-test cycle without interruption. The device runs a BMS verification sequence at startup — cutting power during this window stores a false battery fault that persists until the next clean boot.

Self-test failure after battery swap on the S/5 Light Monitor

The Ohmeda S/5 runs a battery learn cycle during its first few charge-discharge sequences with a new cell. Until that cycle completes, the BMS applies conservative charge limits and may flag a self-test warning — this is not a faulty battery. Run one full charge-discharge cycle before relying on the device clinically. The BMS recalibrates its capacity estimate after the first full cycle and the self-test warning clears on subsequent boots.

Charge indicator stalling below 100% on first charge

On a fresh Ni-MH cell, the Ohmeda charge IC applies a deliberately conservative current limit during the first charge to avoid overheating a new cell with an unknown thermal history. The charge percentage reported on screen lags behind actual cell state during this phase. Let the charge cycle run to termination without unplugging — the IC uses delta-V detection to confirm full charge, not a timer. After the first complete cycle, reported charge percentage aligns with actual capacity.