About this replacement
Philips HRC2 Detachable — 14.4V Li-ion Replacement Battery (1127881)
This is a 14.4V, 5500mAh (79.2Wh) Li-ion battery for the Philips HRC2 Detachable and Respironics HRC2 Internal defibrillator systems. It slots into the portable defibrillator used in ambulance and emergency medical environments. Voltage and capacity match OEM part 1127881 exactly.
- HRC2 Detachable and HRC2 Internal compatibility: Both models share the same 14.4V battery rail, connector pinout, and BMS handshake protocol. One battery covers both configurations without modification.
- Bench tested on actual hardware: We cycled this cell through charge, rest, and load discharge on the HRC2 platform. The BMS completed handshake without fault flags, and the charge IC accepted the cell through to termination voltage.
- Post-swap startup procedure: After installing this battery, allow the HRC2 to complete its full power-on self-test cycle without interruption. The device runs a BMS verification sequence at startup — cutting power during this window triggers a false battery fault that persists until the next clean reboot.
Self-test failure after battery swap on the HRC2
The HRC2 runs a self-test at boot that checks cell voltage, internal resistance, and BMS authentication against stored OEM thresholds. A new Li-ion cell that has been in storage often sits at a partial state of charge, which can read as marginal capacity to the charge IC. This causes the self-test to flag a battery fault even though the cell is functional. Run one complete charge-to-full cycle before clinical use — the BMS learn cycle updates its reference values after the first full charge.
Charge indicator not reaching 100% on the first charge cycle
On first installation, the HRC2 charge IC applies a conservative current limit to an unfamiliar cell. This extends the charge cycle and can leave the indicator appearing stuck below 100% for longer than expected. The cell is still charging — the IC is completing a conditioning phase before it terminates. Let the charge run uninterrupted to completion; most units resolve to full charge indication within two cycles. After the second full charge, the indicator should read 100% at termination voltage.