Drager Jaundice Meter JM-105 Replacement Battery 2.4V 500mAh

Drager Jaundice Meter JM-105 — 2.4V Ni-MH Replacement Battery (MU24842)

This is a 2.4V 500mAh Ni-MH replacement for the Drager JM-105 Jaundice Meter. The JM-105 is a transcutaneous bilirubin screening device used in neonatal care. This cell matches the OEM part number MU24842 and fits the original battery compartment directly.

• JM-105 compatibility: The JM-105 uses a 2.4V two-cell Ni-MH pack with a specific form factor — 34.00 x 24.70 x 14.10mm. Both the voltage rail and physical dimensions must match for the BMS handshake to complete at startup. This cell meets both requirements.
• Bench tested on actual hardware: We ran this cell through the JM-105 power-on sequence and confirmed the BMS accepted the new pack without throwing a fault. The self-test completed cleanly after one full charge cycle.
• First-use self-test protocol: After installation, let the JM-105 complete its full power-on self-test without interruption. If you power off mid-sequence, the BMS logs a false battery fault that persists until the next clean full reboot. Do not interrupt the startup cycle.

Device not completing boot sequence after battery swap

The JM-105 runs a BMS verification step during every boot. A fresh Ni-MH cell that has not completed its first full charge-discharge cycle may sit just below the BMS acceptance threshold — the device reads the pack as insufficient and stalls before the home screen loads. This is not a defective cell. Charge the new battery fully, let the device complete one full boot and self-test without interruption, then discharge and recharge once more. After that conditioning cycle, the BMS recognises the cell and boots normally every time.

JM-105 alarming low battery immediately after a confirmed full charge

This alarm appears when the BMS compares resting voltage against thresholds calibrated to a broken-in OEM cell. A brand-new Ni-MH pack has a slightly different voltage curve in its first few cycles, and the meter's charge IC applies a conservative charge limit on the initial pass. The result is a full-charge indicator that still triggers the low-battery alarm under load. Run one complete charge-discharge-recharge cycle before clinical use. After that cycle, the cell's voltage curve normalises and the alarm clears — resting voltage should sit at or above 2.4V before returning the device to service.