ActiveCare + S.F.T 7.2V Replacement Battery B11707 Ni-MH

Medical Compression System ActiveCare + S.F.T — 7.2V Ni-MH Replacement Battery (B11707)

This is a 7.2V, 2500mAh Ni-MH replacement battery for the Medical Compression System ActiveCare + S.F.T sequential compression therapy unit. It replaces OEM part number B11707. The ActiveCare + S.F.T delivers pneumatic compression therapy for venous insufficiency, post-operative swelling, and lymphatic drainage — and it depends on a stable, correctly profiled battery to complete each therapy cycle without interruption.

• ActiveCare + S.F.T platform fit: The B11707 cell pack runs at 7.2V nominal and matches the connector pinout and BMS communication protocol the ActiveCare + S.F.T controller expects. Swapping in a cell at a different voltage rail causes the charge IC to reject the pack outright.
• Bench tested on actual hardware: We cycled this pack through the ActiveCare + S.F.T charge-discharge sequence. The BMS registered correct cell chemistry on handshake, accepted a full charge without flagging a fault, and held load across a complete compression cycle sequence without voltage sag tripping the cutoff.
• Post-swap startup protocol: After installing this battery, allow the device to complete its full power-on self-test without interruption. The ActiveCare + S.F.T runs a BMS verification sequence at every boot — cutting power during this window writes a fault flag that persists until the next full reboot.

Charge indicator not reaching 100% on the first charge after installation

The ActiveCare + S.F.T charge IC applies a conservative current limit when it first sees a new Ni-MH cell pack. This is intentional — the controller profiles the internal resistance before allowing a full charge acceptance. On the first charge, the indicator may plateau at 85–90% and stop climbing. Run one complete charge-discharge cycle and the controller recalibrates its end-of-charge threshold. After that cycle, the indicator should reach 100% consistently.

Device fails self-test and shows a battery fault after a confirmed successful charge

This happens when the BMS learn cycle has not completed. The ActiveCare + S.F.T sets its self-test pass threshold against stored OEM cell data, and a new replacement pack does not yet have a discharge history logged. The device reads the cell as outside expected parameters and flags it as faulty even though the charge level is correct. The fix is one full charge-discharge cycle before clinical use — after that cycle, the BMS updates its reference data and the self-test passes at 7.2V nominal.