About this replacement
CONTEC CMS6000 Patient Monitor — 7.4V Li-Polymer Replacement Battery (88889457)
This 7.4V 3800mAh (28.12Wh) Li-Polymer battery replaces OEM part 88889457 in the CONTEC CMS6000 portable patient monitor. The CMS6000 is used in clinical and home healthcare settings to measure SpO2, heart rate, and blood pressure. This battery keeps the monitor running during assessments away from mains power.
- CMS6000 compatibility: The CMS6000 uses a BMS that handshakes with the battery on boot to verify cell chemistry and voltage range. This replacement matches the 7.4V Li-Polymer profile the monitor expects, so the BMS completes its verification pass without triggering a fault.
- Bench tested on actual hardware: We cycled this battery through the CMS6000 power-on self-test sequence and monitored BMS communication. The cell passed the charge verification threshold and the monitor reached full operational status without raising a battery fault flag.
- Post-install self-test procedure: After fitting this battery, let the CMS6000 complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — cutting power mid-sequence logs a false battery fault that will persist until the next clean reboot cycle.
CMS6000 not completing boot sequence on a new replacement battery
The CMS6000 BMS checks cell voltage and chemistry during the boot sequence before allowing the monitor to reach its main screen. A new Li-Polymer cell that shipped at storage voltage — typically around 3.7V per cell — can sit below the monitor's boot-pass threshold. If the device stalls mid-boot, connect it to mains power first and allow it to charge for at least two hours before attempting to boot on battery alone. Once the cell has received its first full charge, the BMS threshold check passes cleanly on subsequent power-ons.
Low battery alarm triggering immediately after a confirmed full charge
The CMS6000 alarm threshold is calibrated against the charge profile the BMS expects from a conditioned cell. A brand-new Li-Polymer cell has not completed its first formation cycle, so the charge IC applies a conservative capacity limit and the BMS reads available energy below the alarm cutoff. This is not a fault with the battery. Run one complete charge-discharge cycle — charge to full, allow the monitor to draw the cell down through normal use, then recharge fully — and the BMS recalibrates its state-of-charge reading. After that first cycle, the alarm threshold behaves normally and should not trigger above 3.5V per cell under load.