why does my Volkswagen Passat B8 (2015-2022) battery die when parked for a few days

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Battery Replacement (if necessary)

• Remove the positive terminal first followed by the negative terminal.
• Unscrew any retaining brackets or clamps holding the battery in place.
• Carefully lift the old battery out of the tray.
• Place the new battery in the tray, ensuring it is secure.
• Reattach the battery terminals, connecting the positive terminal first, followed by the negative terminal.

3. Address Parasitic Drain

• Identify the circuit causing the drain by pulling fuses one at a time while monitoring the ammeter.
• Once the faulty circuit is identified, inspect and repair or replace the faulty component (e.g., a door latch switch, interior light).

4. Clean Battery Terminals

• Clean any corrosion from the battery terminals and connectors using a mixture of baking soda and water.
• Rinse and dry completely before reconnecting.