my Skoda Octavia NFL (2020-Present) battery dies overnight even when not in use

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, wire brush, safety gloves.
• Safety Warnings: Disconnect the battery before inspecting electrical components to prevent short circuits.

2. Battery Inspection and Testing

• 1.1. Visual Inspection:

  • Check the battery for any signs of physical damage or leaks.

• 1.2. Voltage Check:

  • Use a multimeter to confirm the battery voltage. If below 12.4 volts, consider recharging or replacing the battery.

3. Clean and Tighten Battery Connections

• 2.1. Disconnect Battery:

  • Disconnect the negative (-) terminal first, followed by the positive (+) terminal.

• 2.2. Clean Terminals:

  • Use a wire brush to clean any corrosion from the terminals and battery posts.

• 2.3. Reconnect Battery:

  • Reconnect the positive (+) terminal first, then the negative (-) terminal, ensuring they are tight.

4. Resolve Parasitic Draw

• 3.1. Identify Faulty Circuit:

  • If high draw is detected, systematically remove fuses to find which circuit is responsible.

• 3.2. Repair or Replace Components:

  • Once a circuit is identified, inspect the components on that circuit (e.g., lights, modules) for malfunction, and repair or replace as necessary.

5. Final Steps

• 4.1. Test Battery:

  • After repairs, reconnect the battery and test again with the multimeter to ensure voltage is stable.

• 4.2. Monitor Vehicle:

  • Leave the vehicle unused for a night to ensure that the battery does not drain again.