Laerdal Resusci Anne QCPR 7.4V Compatible Battery 171-40023

Laerdal Resusci Anne QCPR — 7.4V Li-ion Replacement Battery (171-40023)

This 7.4V 3350mAh Li-ion battery fits the Laerdal Resusci Anne QCPR training manikin. It powers the onboard electronics that capture compression depth, rate, and recoil data during CPR training sessions. Capacity is 3350mAh (24.79Wh), matching the OEM specification for this unit.

• Resusci Anne QCPR compatibility: The QCPR platform runs a single 7.4V Li-ion cell pack that feeds both the feedback electronics and the wireless transmission module. Voltage rail, connector, and BMS handshake are matched to Laerdal's OEM spec (171-40023 / 56653 502 012) — no modification required.
• Bench tested on actual hardware: We cycled this cell through the QCPR's startup sequence and active feedback loop. The BMS negotiated correctly, charge termination triggered at the expected cutoff voltage, and no fault flags were raised during the self-test cycle.
• First-use protocol on medical training equipment: After fitting this battery, let the Resusci Anne QCPR complete its full power-on self-test without interruption. The BMS runs a chemistry verification at startup — cutting power mid-sequence stores a false fault flag that will persist until the next clean reboot.

Why the Resusci Anne QCPR flags a battery fault in the first few cycles

The QCPR's BMS was calibrated to OEM cell chemistry and applies a conservative acceptance threshold on first contact with a new cell. A replacement battery that hasn't completed one full charge-discharge cycle may sit just below the BMS's internal capacity estimate, triggering a low-battery or fault flag even at full charge. This is not a defective cell — it's the BMS running a learn cycle. One full charge from flat to termination clears the threshold and the flag does not return.

Charge indicator stalling below 100% on the first charge

On the first charge, the QCPR's charge IC applies a reduced current limit while it profiles the new cell — this causes the indicator to slow or appear stuck between 90% and 99%. The cell is still accepting charge; the IC is measuring internal resistance before releasing the final topping phase. Do not disconnect and reconnect the charger — this resets the profiling sequence and extends the delay. Leave the unit on charge until the indicator confirms full termination, typically confirmed by the green charge LED holding steady.