CardioRapid K360 12V Replacement Battery 2000mAh Ni-MH

CardioRapid K360 — 12V Ni-MH Replacement Battery

This 12V 2000mAh Ni-MH battery is a direct replacement for the CardioRapid K360 automated external defibrillator. The K360 is a portable AED used in emergency cardiac care settings. Voltage and capacity match the original cell: 12V, 2000mAh (24Wh).

• K360 AED platform: The K360 runs a tightly managed power architecture — the BMS monitors cell voltage, temperature, and charge state continuously. Ni-MH chemistry is specified here because the device's charge IC and internal BMS are calibrated to Ni-MH charge curves, not lithium. Swapping chemistry type would cause charge faults and self-test failures.
• Bench tested on actual hardware: We cycled this cell through the K360's startup self-test sequence and confirmed the BMS accepted the new cell without fault codes. The charge IC applied its standard trickle-to-fast-charge transition at the correct voltage threshold, and the battery passed the device's internal capacity verification check.
• First-use self-test protocol: After installation, let the K360 complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power mid-cycle causes a false battery fault that persists until the next clean reboot. One complete charge-discharge cycle clears the BMS learn flag before the unit is placed back in service.

K360 self-test failure after battery swap

The K360 runs an internal self-test each time it powers on, and the BMS compares the new cell's voltage profile against a stored OEM baseline. A fresh Ni-MH cell that has not been cycled yet can read slightly below the BMS threshold — enough to trigger a self-test fault even when the battery is fully charged. This is not a faulty battery. Run one full charge-discharge cycle on the new cell before placing the device in clinical use. After that cycle, the BMS calibrates its threshold to the actual cell and self-test passes cleanly.

K360 showing low battery alarm immediately after confirmed full charge

The low battery alarm on the K360 triggers off a voltage threshold, not a simple charge indicator. Ni-MH cells that have sat in storage self-discharge slowly, and the resting voltage of a depleted cell can remain close to but below the BMS recovery floor. If the charger completes but the alarm persists, the cell likely charged partially — the charge IC applies a conservative current limit on the first cycle. Place the battery on charge again immediately after the first cycle completes. After the second full charge, resting voltage typically stabilises above 12.0V and the alarm clears.