COMEN V3A Patient Monitor Replacement Battery 14.4V 6700mAh

COMEN V3A / V3 Series — 14.4V Li-ion Replacement Battery (CMLI2X4I001B)

This is a 14.4V, 6700mAh lithium-ion battery for the COMEN V3A and V3 portable patient monitors. These monitors display ECG, SpO2, NIBP, and temperature — all of which rely on uninterrupted DC power when the unit is off-grid or being transported between wards. This cell replaces OEM part CMLI2X4I001B at matching voltage and capacity.

• V3A and V3 platform fit: Both models use the same battery bay, connector pinout, and BMS communication protocol. The V3A adds a slightly expanded display set, but the power architecture is shared — one battery covers both.
• Bench tested on actual hardware: We ran this cell through full charge and load cycles on a V3A unit. The onboard BMS accepted the cell, completed charge handshake without fault flags, and held voltage within spec under the combined sensor and display load.
• Post-swap self-test protocol: After fitting this battery, allow the V3A to complete its full power-on self-test without interrupting it. The device runs a BMS verification step at boot — cutting power during this sequence stores a false battery fault that persists until the next clean reboot.

Why the V3A reports a battery fault immediately after a confirmed full charge

The V3A's BMS compares cell internal resistance and charge acceptance against stored OEM thresholds at startup. A new replacement cell has not yet completed a full charge-discharge learn cycle, so its resistance profile sits outside the narrow window the BMS expects. The monitor flags this as a fault even when the cell is genuinely at full capacity. Running one complete charge-discharge cycle — charging to 100% and allowing the device to draw the cell down under normal use — resets the BMS baseline and clears the fault on the next boot.

Charge indicator stalling below 100% on first charge

On the first charge cycle, the V3A's charge IC applies a conservative current limit to an unrecognised cell, which causes the charge indicator to plateau between 85% and 95% without climbing further. This is the IC protecting the new cell, not a fault in the battery. Disconnect the charger, power the unit on to draw the cell down slightly, then reconnect and allow a second full charge. The IC recalibrates on the second pass and the indicator reaches 100%.