Medtronic Lifepak 20e Replacement Battery 11.1V 7800mAh

Medtronic 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 Medtronic Physio-Control Lifepak 20e defibrillator. It matches the OEM voltage and capacity spec (86.58Wh) required by the device's power management system. The Lifepak 20e is a clinical-grade AED used for cardiac rhythm analysis and defibrillation in emergency settings.

• Lifepak 20e platform fit: The 20e uses a dedicated battery bay with a BMS handshake tied to the OEM cell chemistry profile. This replacement cell runs the same 11.1V three-cell Li-ion configuration and passes the device's battery authentication check without triggering a fault state.
• Bench tested on actual hardware: We ran this battery through the Lifepak 20e power-on sequence and charge cycle. The BMS accepted the cell, the charge indicator tracked normally, and the device completed its internal self-test without a battery fault flag.
• Post-installation self-test protocol: After fitting this battery, do not interrupt the Lifepak 20e's boot sequence. The device runs a BMS verification cycle at startup — cutting power before it finishes writes a false battery fault to memory that persists until the next full reboot. Let the sequence complete before moving the device to standby.

Why the Lifepak 20e flags a battery fault on the first charge cycle

The 20e's charge IC applies a conservative current limit on cells it hasn't previously profiled. On a new replacement battery, the first charge cycle ends before the indicator reaches 100% — this is the charge controller protecting against an uncharacterised cell, not a fault with the battery itself. The BMS stores the charge data from that first cycle and adjusts on subsequent charges. Running one complete charge-discharge cycle resolves the issue before the battery is placed in clinical service.

Lifepak 20e not powering on after battery sat in storage

Li-ion cells self-discharge during storage. If the voltage drops below approximately 9V, the Lifepak 20e's BMS treats the cell as over-discharged and blocks power delivery as a protection measure. Placing the battery on a standalone Li-ion charger for 15–20 minutes at a low recovery current can bring the cell voltage back above the BMS recovery threshold. Once the cell reads above 10V, reinstall it and initiate a full charge cycle on the device before use.