Mindray Umec10 LI23S005A Replacement Battery 11.1V 6400mAh

Mindray Umec10 — 11.1V Li-ion Replacement Battery (LI23S005A)

This 11.1V, 6400mAh (71.04Wh) lithium-ion battery replaces part number LI23S005A in the Mindray Umec10 portable patient monitor. It fits the Umec10's battery bay directly and matches the original voltage rail the device expects. Cell chemistry is Li-ion, matching the charge profile the Umec10's charge IC is calibrated for.

• Umec10 battery bay fit: The Umec10 uses a single-bay pack at 11.1V nominal. The BMS in this pack communicates state-of-charge data back to the monitor via the same SMBus lines as the original LI23S005A. No connector modification needed.
• Bench tested on actual hardware: We cycled this pack through full charge and load discharge on the Umec10 platform. The BMS reported accurate state-of-charge at each 10% interval, and the low-battery threshold triggered at the correct voltage without premature cutoff.
• Post-swap self-test requirement: After installation, let the Umec10 complete its full power-on self-test without interruption. The monitor runs a BMS verification sequence at startup — cutting power during this window creates a false battery fault that persists until the next complete reboot.

Why the Umec10 alarms low battery immediately after a confirmed full charge

The Umec10's BMS uses stored calibration data from the previous cell to set its state-of-charge baseline. A new pack with no cycle history doesn't match those stored parameters, so the monitor flags it as low even when the cells are full. Running one complete charge-to-discharge cycle lets the BMS recalibrate its capacity estimate against the new cell's actual behaviour. After that first full cycle, the alarm clears and state-of-charge reporting tracks correctly.

Umec10 will not power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If the pack voltage dropped below approximately 9V per cell group, the Umec10's BMS enters deep-discharge protection and blocks output entirely — the monitor shows nothing when you press power. Connect the pack to the Umec10 on mains power and leave it charging for at least 90 minutes before attempting to power on. This allows the charge IC to trickle-charge the cells above the BMS recovery threshold, typically around 10.5V, at which point normal charging and boot resume.