Maquet CARDIOHELP 10.8V 7800mAh Li-ion Compatible Battery 43.889.0209

Maquet CARDIOHELP / PULMONAR CARDIOHELP — 10.8V Li-ion Replacement Battery (43.889.0209)

This 10.8V 7800mAh Li-ion battery replaces the internal power cell in the Maquet Getinge CARDIOHELP and PULMONAR CARDIOHELP extracorporeal life support systems. It matches OEM part numbers 43.889.0209, 350-0149-BA, 70104.930, 90009008, and 701049130. Voltage and capacity align to OEM specification — 10.8V nominal, 84.24Wh total energy.

• CARDIOHELP and PULMONAR CARDIOHELP platform fit: Both units share the same battery bay geometry, BMS communication protocol, and 10.8V three-cell series configuration. The connector pinout and charge handshake are identical across the platform, so one cell replacement covers both listed models without hardware modification.
• Bench tested on actual hardware: We ran this cell through the CARDIOHELP charge cycle and monitored BMS handshake at each stage. The protection circuit responded correctly to charge termination, over-current cutoff, and low-voltage recovery — all within OEM thresholds before we ship.
• Post-swap startup procedure: After installing this battery, let the CARDIOHELP complete its full power-on self-test without interruption. The BMS runs a verification sequence at boot — cutting power mid-test causes a false battery fault that persists until the next full reboot cycle, not the next charge.

BMS learn cycle on first use in the CARDIOHELP

The CARDIOHELP BMS was calibrated to the charge and discharge curve of the OEM cell. A replacement cell with a fresh anode state behaves slightly differently in the first several cycles — the BMS capacity estimate drifts until it has mapped the new cell's actual curve. This appears as a fluctuating charge indicator or a state-of-charge reading that doesn't track linearly. Run one complete charge-to-full followed by a controlled discharge before placing the unit into clinical rotation — this closes the calibration gap and gives the BMS an accurate baseline.

Charge indicator stalls below 100% on initial charge

On first charge after installation, the CARDIOHELP charge IC applies a conservative current limit to an uncharacterised cell — this causes the indicator to plateau at 90–95% and hold there longer than expected. The cell is not faulty and the charge circuit is not stuck. The IC completes a trickle-top phase before releasing the 100% indication. Allow the charge cycle to complete fully without disconnecting — the indicator will reach 100% once the charge IC confirms cell voltage has stabilised at 12.6V.