why does my Skoda Octavia NFL (2020-Present) battery die overnight when parked

Solution

1. Preparation

• Tools Needed: OBD-II scanner, multimeter, socket set, battery terminal cleaner, safety glasses, gloves.
• Disconnect the negative battery terminal to prevent any electrical shorts while working on the vehicle.

2. Clean Battery Terminals

• Remove the battery terminals (negative first, then positive).
• Clean the terminals and battery posts using a battery terminal cleaner to remove any corrosion.
• Reconnect the terminals (positive first, then negative) and ensure they are tight.

3. Replace the Battery (if necessary)

• If the load test indicates the battery is weak or unable to hold a charge:
  1. Remove the battery securing bracket using the socket set.
  2. Carefully lift the old battery out of the vehicle.
  3. Place the new battery in the battery tray, ensuring it is seated properly.
  4. Reattach the securing bracket and tighten as per manufacturer specifications.
  5. Connect the positive terminal first, followed by the negative terminal.

4. Repair or Replace Faulty Components

• If any faulty components are identified during the diagnostic steps:
  1. Replace any blown fuses or damaged wiring as needed.
  2. If the alternator is faulty, remove it by disconnecting the battery and following the service manual for proper removal procedures.
  3. Install a new alternator and reconnect all electrical connections.

5. Final Check

• Reconnect the negative battery terminal. Start the vehicle and check the voltage at the battery using a multimeter (should be around 13.8-14.4 volts).
• Monitor the vehicle for any ongoing electrical issues.