my BMW X3 G01 (2018-2024) battery keeps dying overnight what's wrong

Solution

1. Preparation

• Tools Required: Multimeter, wrench set, battery terminal cleaner, load tester.
• Disconnect the battery by removing the negative terminal first, followed by the positive terminal.

2. Clean Battery Terminals

• Use a battery terminal cleaner to remove any corrosion from the battery terminals.
• Reconnect the battery terminals, starting with the positive terminal followed by the negative terminal.

3. Replace Battery (if needed)

• If the battery is found to be faulty during testing, follow these steps:
  • Disconnect the battery as previously outlined.
  • Remove any securing brackets or bolts holding the battery in place.
  • Carefully lift the old battery out of the vehicle.
  • Place the new battery in the same orientation and secure it with brackets.
  • Reconnect the positive terminal first, then the negative terminal.

4. Address Electrical Issues

• If parasitic draw is detected, systematically remove fuses one at a time while monitoring the amp meter until the draw drops significantly. Identify and repair any components related to the problematic circuit.

5. Final Checks

• Recheck all connections and ensure that no tools are left in the engine bay.
• Reconnect any removed fuses and ensure all electrical components are functioning normally.