my BMW X5 F15 (2014-2019) battery keeps dying what could it be

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, ammeter, socket set, and cleaning materials.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Battery Inspection and Cleaning

• Remove the battery from the vehicle.
• Clean the battery terminals and cable connections using a wire brush and baking soda solution to remove corrosion.
• Inspect the battery casing for any cracks or damage that might indicate a failure.
• Reinstall the battery and ensure all connections are tight.

3. Alternator Testing and Replacement if Necessary

• With the engine running, use the multimeter to measure the voltage at the battery terminals.
• If the voltage is below 13.8V, check the alternator connections and replace the alternator if faulty.
• Remove the drive belt using a socket set and replace the alternator, ensuring to torque the bolts to manufacturer specifications.

4. Addressing Parasitic Draw

• Reconnect the battery and set the ammeter to measure current draw.
• If the draw is above 50 mA, systematically disconnect fuses to identify the circuit causing the excessive draw.
• Repair or replace any faulty components identified in the draw test.