Physio-Control Lifepak 20e 11.1V Replacement Battery 7800mAh

Physio-Control Lifepak 20e — 11.1V Li-ion Replacement Battery (11141-000112)

This 11.1V, 7800mAh lithium-ion battery is a direct replacement for the Physio-Control Lifepak 20e defibrillator. It fits units referencing OEM part numbers 11141-000112, 3205296-002, 3205296-003, and 3205296-004. Capacity matches the original at 86.58Wh.

• Lifepak 20e platform fit: The 20e uses a BMS that authenticates the battery's voltage rail and cell count at startup. All four OEM cross-references share the same 11.1V three-cell configuration and connector, so this replacement clears the handshake check on current 20e firmware.
• Bench tested on actual hardware: We cycled this battery through the 20e's charge circuit and confirmed BMS communication, charge acceptance, and full voltage delivery under defibrillator load. The protection circuit responded correctly to charge termination and discharge cutoff events.
• Post-installation self-test protocol: After fitting this battery, allow the Lifepak 20e to complete its full power-on self-test without interruption. The device runs BMS verification at startup — cutting power mid-sequence registers a false battery fault that persists until the next complete reboot.

Lifepak 20e self-test failure after battery swap

The 20e runs an internal self-test on every power cycle that checks BMS state, cell voltage balance, and charge level against internal thresholds. A new cell that hasn't completed one full charge-discharge cycle may sit outside the BMS's expected state-of-charge window, triggering a self-test fault even though the battery is functional. This is a BMS learn-cycle issue, not a hardware fault. Run one complete charge cycle to 100%, then discharge under normal device use before treating the result as clinically valid.

Charge indicator stalls below 100% on first charge

On first charge, the Lifepak 20e's charge IC applies a conservative current limit when it encounters a cell pack it hasn't profiled before. This causes the charge indicator to plateau — typically between 85% and 95% — before the IC completes its assessment and resumes normal rate. The battery is not defective. Let the charge cycle complete without interrupting it; the IC will release the hold and top the cells off to full. After the first full cycle, subsequent charges should reach 100% without stalling.