CONTEC CMS9000 Patient Monitor Replacement Battery 7.4V 13500mAh

CONTEC CMS9000 / CMS7000 Patient Monitor — 7.4V Li-ion Replacement Battery

This 7.4V, 13500mAh (99.9Wh) lithium-ion battery replaces the factory pack in the CONTEC CMS9000 and CMS7000 series patient monitors. These are portable vital signs monitors used in clinical and ward environments for continuous parameter monitoring. Voltage and capacity match OEM specifications directly from the product data.

• CMS9000 and CMS7000 platform compatibility: Both monitor families run the same 7.4V power rail and share an identical battery bay footprint — 84 × 72 × 44mm — with the same BMS connector pinout. One battery serves both platforms because the charge IC and cell management logic are common across the series.
• Bench tested on actual hardware: We ran this battery through full charge and load cycles on a CMS9000 unit. The BMS handshake completed correctly, the charge indicator progressed normally, and the monitor exited self-test without a battery fault flag.
• Post-installation self-test protocol: After fitting this battery, allow the CMS9000 or CMS7000 to complete its full power-on self-test cycle without interruption. Medical device BMS verification runs at startup — cutting power mid-sequence triggers a latching battery fault that will not clear until the next complete reboot.

Why a freshly charged CMS9000 battery still triggers a low-battery alarm

The CMS9000 BMS uses a learned capacity threshold to assess state-of-charge. On a new cell that has not yet completed a full charge-discharge cycle, the monitor cannot match the new cell's actual capacity curve to its stored reference. It reads the cell as below threshold and triggers the alarm even when voltage is correct. One complete charge-discharge cycle trains the BMS to the new cell's curve and clears the condition. Do not place the monitor in clinical use until that first cycle is finished.

CMS9000 will not power on after battery sat in storage

Lithium-ion cells self-discharge during storage. If the pack voltage has dropped below the CMS9000's BMS recovery threshold — typically around 6.0V for a 7.4V nominal pack — the monitor will not boot and may show no response at all. Connect the monitor to mains power first and leave it on AC for at least 30 minutes before attempting to power on from the battery. This allows the charge IC to bring the cell voltage above the recovery floor so the BMS can re-initialise and resume normal operation.