Edan X12 10.8V Replacement Battery 01.21.064381 5200mAh

Edan X12 / F15 — 10.8V Li-ion Replacement Battery (01.21.064381)

This is a 10.8V 5200mAh Li-ion replacement battery for the Edan X12 and F15 portable ECG machines. It fits both models directly and matches the OEM voltage rail, connector, and BMS communication protocol. Capacity listed is 5200mAh (56.16Wh) — sourced from the product specification, not estimated.

• X12 and F15 platform compatibility: Both models run the same 10.8V three-cell Li-ion architecture with an identical battery bay connector and BMS handshake. The charge IC on each device reads cell chemistry and pack ID from the same register — so one battery services both without modification.
• Bench tested on actual hardware: We ran a full charge-discharge cycle on the X12 platform and confirmed the BMS accepted the pack, completed cell balancing, and passed the internal resistance check without fault codes. State-of-charge reporting tracked accurately across the display after cycle one.
• Post-swap self-test protocol: After fitting the replacement, allow the X12 or F15 to complete its full power-on self-test without interruption. The BMS runs a verification routine at startup — cutting power during this sequence logs a false battery fault that persists until the next clean reboot.

Why the Edan X12 alarms low battery immediately after a confirmed full charge

The X12 charge IC applies an OEM-calibrated threshold when reading state-of-charge from a new pack. A new cell's internal resistance profile sits slightly outside the learned window, so the BMS flags it as low before the first full cycle recalibrates the baseline. This is a data mismatch, not a faulty battery. Run one complete charge-discharge cycle uninterrupted — the alarm clears once the BMS has a full capacity reference point logged against the new cell chemistry.

Edan X12 not completing boot sequence after battery replacement

If the device stalls mid-boot or loops the startup screen after a battery swap, the pack voltage has likely dropped below the BMS recovery threshold during storage — typically under 9.0V. The X12 boot sequence requires stable voltage above this floor before POST completes. Connect the device to mains power and leave it charging for at least 30 minutes before attempting to power on again. Once the pack reaches approximately 10.0V, the boot sequence will complete and the self-test will run normally.