About this replacement
Physio-Control LifePak 20 Series — 11.1V Li-ion Replacement Battery (11141-000162)
This 11.1V, 2600mAh (28.86Wh) lithium-ion battery replaces the OEM pack in the Physio-Control LifePak 20 Defibrillator and LifePak 20e Defibrillator. It also fits the LifePak 20 Code Management Module. The cell chemistry, voltage rail, and connector match the original specification.
- LifePak 20 and 20e compatibility: Both the standard LifePak 20 and the 20e share the same 11.1V three-cell lithium-ion architecture and the same BMS communication protocol. One battery covers the full platform without modification.
- Bench tested on actual hardware: We ran charge and discharge cycles on a LifePak 20 unit. The BMS accepted the pack without fault codes, completed its internal resistance check, and transitioned to float correctly at capacity.
- Post-installation self-test cycle: After fitting this battery, let the LifePak 20 complete its full power-on self-test without interruption. The device runs a BMS verification pass at startup. Cutting power during that sequence logs a false battery fault that persists until the next clean reboot.
Charge indicator not reaching 100% on the first charge after installation
The LifePak 20 charge IC applies a conservative current limit when it first interrogates an unfamiliar cell pack. On a new battery, the charge algorithm starts cautiously and may plateau below 100% on the initial cycle. This is normal BMS behaviour, not a fault with the battery. Run one full charge-to-discharge-to-charge cycle and the charge IC recalibrates its capacity estimation correctly.
LifePak 20 shutting off unexpectedly during the first few uses
Defibrillator load profiles hit a new cell hard — the high-current draw during charge delivery stresses cells that have not yet completed their formation cycles. In the first ten cycles, internal resistance reads slightly elevated, and the BMS may trip the low-voltage cutoff earlier than expected under peak load. This is not a defective battery; it resolves as the cells condition. Complete at least one full charge-discharge cycle before placing the unit in clinical service, and confirm resting cell voltage sits above 10.8V after a full charge.