SEAT Born 2022 Emergency Supply Replacement Battery 7.4V 3400mAh

SEAT Born 2022 / Formentor KM / Leon KL — 7.4V Li-ion Replacement Battery (3G0915089)

This is a 7.4V 3400mAh Li-ion replacement for the emergency supply battery fitted across several SEAT and Volkswagen Group models. It directly replaces OEM part 3G0915089 and cross-references EAC63298904, EAC63298909, and EC-VW-OCU3. The battery powers onboard emergency equipment — including emergency lighting and warning systems — when the main vehicle supply is unavailable.

• Multi-model fitment — Born, Formentor KM, Ibiza KJ, Leon KL: These models share a common emergency supply module with the same connector pinout, voltage rail, and BMS handshake protocol. One battery covers all of them.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the emergency supply module. The BMS accepted the battery after one complete cycle and cleared the low-battery flag without manual reset.
• Post-install charge cycle — do not skip it: The emergency supply management system in these vehicles will not trust a new battery's runtime estimate until it completes one full charge cycle from near-empty. Install the battery, then allow a full charge before relying on the unit in an emergency situation.

Why the emergency supply unit shows a battery error after installation

The emergency supply module runs a firmware-level battery-check sequence when it detects a new or recently disconnected battery. This sequence checks cell voltage, internal resistance, and BMS communication before clearing the error flag. If the battery voltage is slightly below the module's acceptance threshold — common after shipping — the unit will show an error and refuse to arm. Place the unit on charge for at least two hours after installing the new battery. The error flag clears automatically once the module completes its validation cycle.

Self-test failure on the emergency module after a battery swap

A self-test failure directly after installation almost always means the battery management system has not yet completed its calibration cycle. The module's self-test checks stored capacity data — data that only exists after one full charge-discharge cycle has been logged. Running the self-test immediately after fitting a new battery gives the module no baseline to validate against. Charge the battery fully, allow the module to discharge it through normal standby draw, then run the self-test again.