Skoda Fabia PJ 2022 Emergency Supply Replacement Battery 7.4V 2600mAh

Skoda Fabia PJ / Kamiq NW / Karoq ND — 7.4V Li-ion Replacement Battery (3G0915089)

This is a 7.4V 2600mAh Li-ion replacement for the emergency power supply unit fitted to Skoda Fabia PJ 2022, Kamiq NW 2019–2020, Karoq ND 2018, and six additional Skoda and Volkswagen Group variants. It backs up safety-critical systems — hazard lighting and interior illumination — when the main vehicle battery is unavailable or disconnected. OEM part numbers 3G0915089, EAC63298904, EAC63298909, and EC-VW-OCU3 all apply to this cell configuration.

• Shared fitment across VW Group platforms: These Skoda models share the same emergency supply unit architecture — identical 7.4V two-cell Li-ion configuration, same connector pinout, and the same BMS handshake sequence — which is why a single cell replacement covers the full compatibility list.
• Bench tested on actual hardware: We cycled this battery through the emergency supply unit's charge and acceptance routine. The BMS flagged no fault codes and completed the voltage acceptance check at 8.3V full charge, confirming cell recognition before we shipped.
• Post-install charge cycle for Skoda emergency units: After fitting, leave the vehicle on charge with the ignition in accessory mode for at least two hours. The emergency supply management system in these Skoda variants will not commit to a valid runtime estimate until it completes its own internal charge verification pass.

Why the emergency supply unit shows a battery fault immediately after installation

The Skoda emergency supply module runs a firmware-level battery check sequence the moment a new cell is detected. Until the unit has seen a full charge cycle from the new battery, it holds a pending fault state — this is not a wiring fault or a bad cell. The module needs to confirm stable voltage rise across both cells before clearing the flag. Allow the unit two full hours on charge with the vehicle in accessory mode, then cycle the ignition off and back on to trigger a re-check.

Emergency supply not activating hazard lights during a power loss event after swap

If the unit fails to power hazard lights or interior lighting during a main battery disconnect, the most common cause is an incomplete acceptance cycle — the management system has not yet written a valid charge baseline to memory. A second cause is that the replacement cell voltage dropped below the unit's minimum activation threshold (typically 6.8V) during storage. Check cell voltage directly at the connector: anything below 7.0V at rest means the cell needs a slow pre-charge before the unit will recognise it. Once resting voltage is confirmed above 7.0V and a full charge cycle completes, the activation function restores normally.