Welch-Allyn AED 10 Replacement Battery 12V B11387

Welch-Allyn AED 10 Series — 12V Li-MnO2 Replacement Battery (B11387)

This 12V, 3000mAh (36Wh) lithium-manganese dioxide battery replaces part number B11387 in the Welch-Allyn AED 10 and AED 10 Jump Start defibrillators, as well as the Grason Stadler AED 10 Jump Start and Lifequest platforms. Li-MnO2 chemistry is the correct type for this device — it delivers a stable discharge curve at the high-current pulses defibrillation requires. Do not substitute a standard lithium-ion cell; the AED 10's charge circuit and BMS are calibrated to Li-MnO2 characteristics.

• AED 10 platform compatibility: The AED 10, AED 10 Jump Start, and Grason Stadler variant all share the same 12V battery bay, connector pinout, and BMS handshake protocol. One part number covers all three because the voltage rail and communication interface are identical across the platform family.
• Bench tested on actual hardware: We ran this cell through the AED 10's power-on self-test sequence and confirmed the BMS accepted the new cell, completed charge verification, and logged no fault codes. Defibrillation charge cycling was initiated and the cell held voltage through multiple consecutive charge-deliver sequences without triggering low-battery cutoff.
• Post-installation self-test procedure: After fitting this battery, allow the AED 10 to run its full power-on self-test without interruption. The BMS runs a chemistry verification step at startup — cutting power during this sequence registers a persistent battery fault that will not clear until the device completes a clean reboot with the new cell seated.

Why the AED 10 reads low battery immediately after a confirmed full charge

The AED 10's BMS compares resting cell voltage against a threshold table calibrated to an aged OEM cell's charge profile. A new Li-MnO2 cell has a slightly different open-circuit voltage curve in its first few cycles, which can sit just below the BMS acceptance threshold even when fully charged. This is not a fault with the replacement cell — it resolves after one complete charge-discharge-recharge cycle. Run the device through a full self-test cycle, allow it to discharge to the device's automatic cutoff, then recharge fully before returning it to clinical standby.

AED 10 failing self-test after battery swap despite new cell reading 12V

A passing open-circuit voltage of 12V does not guarantee the cell will clear the AED 10's self-test. The self-test applies a brief load pulse and measures voltage sag — a new cell that has not completed one full charge-discharge cycle can show excess voltage drop under that pulse, triggering a self-test failure flag. This is a BMS learn-cycle issue, not a defective battery. Complete one full charge cycle from the device's charge port, then re-run the self-test; the BMS recalibrates its sag threshold after the first complete cycle and the self-test should pass at 12.0V or above under load.