Datex 17014-HEL AS3 Compact Monitor Replacement Battery 24V

Datex AS3 / AS5 / LM Compact Monitor Series — 24V Ni-MH Replacement Battery (17014-HEL)

This is a 24V, 2500mAh Ni-MH replacement battery for the Datex AS3, AS5, LM, and LM-1 Compact patient monitors. These portable monitoring units run ECG, SpO2, blood pressure, and temperature acquisition simultaneously — all drawing from this single battery pack. Capacity is rated at 60Wh.

• Compact Monitor series compatibility: The AS3, AS5, LM, and LM-1 share the same 24V battery architecture, connector pinout, and BMS handshake protocol. Swapping between these models requires no modifications — the pack seats and communicates identically across the series.
• Bench tested on actual hardware: We cycled this pack through the AS3's full power-on self-test sequence and confirmed the BMS negotiation completed without fault flags. The charge IC accepted the cell and reported a clean state-of-charge reading after one full charge cycle.
• Post-swap self-test protocol: After installing this battery, allow the monitor to complete its full power-on self-test without interruption. The device runs a BMS verification step at startup — cutting power during this window writes a fault state that persists until the next clean reboot and can trigger false low-battery alarms in clinical use.

Why the Compact Monitor alarm triggers immediately after a full charge on a new pack

The AS3 and AS5 BMS stores OEM cell chemistry baselines from the factory. A new replacement cell — even fully charged — presents a slightly different impedance signature than the original pack. The monitor's charge-threshold algorithm reads this as a below-limit state and fires the low-battery alarm. One complete charge-discharge cycle allows the BMS to recalibrate its internal capacity model to the new cell. After that cycle, the alarm clears and does not return under normal use.

Monitor fails to complete boot sequence after battery sat in storage

Ni-MH cells self-discharge during storage — typically 15–20% per month at room temperature. If this pack sat for several months before installation, the cell voltage may have dropped below the BMS recovery threshold, which on the Compact Monitor series sits around 18V. Below that threshold, the device halts the boot sequence and shows a blank screen or a battery fault code rather than a low-battery warning. Connect the monitor to mains power and allow it to charge uninterrupted for at least four hours before attempting a standalone boot — this brings the cell above the recovery floor and lets the BMS re-initialise.