Drager JM103 Jaundice Meter Replacement Battery 2.4V 800mAh

Drager JM103 Jaundice Meter — 2.4V Ni-MH Replacement Battery

This 2.4V 800mAh Ni-MH battery is a direct replacement cell for the Drager JM103 Jaundice Meter. The JM103 is a transcutaneous bilirubin meter used for non-invasive newborn jaundice screening in clinical settings. When the original cell degrades, this replacement restores the meter's optical sensor and display to full operating capacity.

• JM103 platform fit: The JM103 uses a low-voltage 2.4V Ni-MH cell because the optical sensor and measurement circuit require a stable, regulated supply well below what Li-ion provides. The physical footprint — 45 × 22 × 10mm — must match exactly or the cell will not seat against the contact pads.
• Bench tested on actual hardware: We ran this cell through the JM103's startup sequence and confirmed the BMS accepted the charge profile without triggering a fault state. The protection circuit held cutoff at the expected low-voltage threshold across repeated charge cycles.
• Post-swap startup procedure: After installing this cell, allow the JM103 to complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup, and cutting power mid-sequence generates a persistent battery fault flag that does not clear until the next complete reboot.

Why the JM103 alarms low battery immediately after a confirmed full charge

The JM103's BMS is calibrated to the discharge curve of the original OEM cell. A new replacement cell has a slightly different internal resistance profile in its first few cycles, which the BMS reads as a voltage sag and flags as low charge. This is a chemistry recognition issue, not a defective cell. Run one complete charge-discharge cycle before clinical use and the BMS recalibrates its threshold to match the new cell's actual curve.

JM103 not powering on after the battery sat unused in storage

Ni-MH cells self-discharge at roughly 1–3% per day at room temperature. A cell stored for several months can drop below the JM103's BMS recovery threshold — typically around 1.0V per cell — at which point the device will not respond to the power button. Place the battery in a compatible Ni-MH charger and apply a slow charge at 0.1C for 30–60 minutes to bring the cell voltage above the recovery floor before reinserting it in the meter.