Physio-Control Lifepak 20 Replacement Battery 12V 3000mAh

Physio-Control Lifepak 20 Defibrillator — 12V Ni-MH Replacement Battery

This is a 12V, 3000mAh (36Wh) Ni-MH replacement battery for the Physio-Control Lifepak 20 defibrillator and cardiac monitor. It fits the Lifepak 20 platform used in emergency medical and clinical settings for defibrillation therapy and patient monitoring. Voltage and capacity match OEM specifications for the Lifepak 20 battery compartment.

• Lifepak 20 platform fit: The Lifepak 20 defibrillator uses a specific 12V Ni-MH pack with a dedicated connector and BMS handshake. This replacement matches that voltage rail and connector geometry so the device recognises the pack and allows normal operation without a persistent battery fault code.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge on the Lifepak 20 platform. The BMS completed its verification pass and the device cleared the battery status alarm after one conditioning cycle, with charge acceptance stabilising by the third cycle.
• Post-swap self-test protocol: After fitting this battery, allow the Lifepak 20 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power mid-sequence stores a false battery fault that will persist until the next clean reboot and completed self-test pass.

Lifepak 20 not completing boot sequence after battery swap

The Lifepak 20 runs a multi-stage boot and BMS initialisation on every power-on. A replacement Ni-MH cell that has been in storage will typically arrive at a reduced state of charge, and the device boot sequence applies a threshold check before clearing the battery as fit for clinical use. If the pack voltage reads below the boot threshold — typically around 11.0V on a 12V Ni-MH pack — the device may stall mid-sequence or loop without completing startup. Charge the battery fully before the first installation, confirm the charger LED indicates a complete charge, then install and allow the full self-test to run without interruption.

Low battery alarm triggers immediately after confirmed full charge

A new Ni-MH cell has not yet gone through a BMS learn cycle on the Lifepak 20 platform, so the device's charge IC applies a conservative capacity estimate on first use. The BMS may flag a low battery alarm even when the pack is at full charge because the learned capacity baseline has not been established. This typically clears after one complete charge-discharge-recharge cycle under normal device load. Run that conditioning cycle before returning the device to active clinical rotation, and confirm the battery status indicator holds green through a full subsequent charge.