Fukuda Denshi FC700A 12V Replacement Battery 3000mAh Ni-MH

Fukuda Denshi FC700A — 12V Ni-MH 3000mAh Replacement Battery

This is a 12V 3000mAh Ni-MH replacement battery for the Fukuda Denshi FC700A electrocardiograph. It fits the FC700A and FC 700A variants used in clinical and portable cardiac diagnostic settings. Voltage and capacity match the original cell configuration to keep the ECG machine running during patient examinations away from mains power.

• FC700A and FC 700A fit: Both model designations run the same 12V battery rail with the same connector housing and BMS handshake protocol — the space between "FC" and "700A" is a regional labelling difference only, not a hardware revision.
• Bench tested on actual hardware: We cycled this battery through the FC700A's charge-discharge sequence and confirmed the BMS accepted the cell, passed its voltage threshold checks, and held stable output across a full ECG recording session load profile.
• Post-install self-test requirement: After fitting this battery, allow the FC700A to complete its full power-on self-test cycle without interruption. The device runs a BMS verification routine at startup — cutting power mid-sequence registers a false battery fault that will persist until the next clean reboot.

FC700A not completing boot sequence on a new battery

The FC700A's boot routine includes a BMS learn step that checks cell voltage against an expected threshold before releasing the main power rail to the display and acquisition board. A new Ni-MH cell that hasn't completed its first full charge-discharge cycle may sit just below this threshold voltage, causing the machine to stall at boot. This is not a faulty battery — it's the BMS applying OEM-calibrated limits to an unconditioned cell. Charge the battery to full using the device's internal charger, then power on and allow the self-test to complete without interruption.

FC700A low battery alarm triggers immediately after a confirmed full charge

Ni-MH cells need at least one full charge-discharge cycle before the BMS can accurately read state-of-charge. On the first few cycles, the charge IC applies a conservative current limit, so the cell may report lower than actual capacity to the device's battery monitor. The alarm trips because the FC700A's threshold is calibrated for a conditioned OEM cell, not a new one at first use. Run one complete charge-discharge cycle through the device before relying on the battery indicator for clinical use — after that cycle, the BMS reading stabilises and the false alarm stops.