why does my Tesla Model S battery die overnight when the car is off

Solution

1. Preparation

• Gather necessary tools and ensure the vehicle is in a safe, well-ventilated area.
• Ensure the vehicle is turned off and keys are removed from the vicinity.

2. Disable Non-Essential Features

• Open the Tesla app or vehicle settings.
  • Sub-steps:
    1. Navigate to "Sentry Mode" and toggle it off if it is enabled.
    2. Disable "Always Connected" settings if not needed.
    3. Turn off any third-party applications that may be accessing the vehicle.

3. Update Software

• Check for available software updates.
  • Sub-steps:
    1. Connect the vehicle to Wi-Fi.
    2. Navigate to "Software" in the settings.
    3. Install any pending updates.

4. Inspect and Replace Components

• Check for abnormal power drain due to faulty components.
  • Sub-steps:
    1. Inspect all electrical connections for corrosion or damage.
    2. Test the 12V battery for proper voltage and replace if necessary (should be around 12.6V).
    3. If needed, replace any faulty fuses that may contribute to energy drain.

5. Test Battery Health

• Run a battery health diagnostic.
  • Sub-steps:
    1. Access the service menu via the touchscreen.
    2. Review battery capacity and health metrics.
    3. If the battery health is below 70%, consider consulting Tesla for potential replacement.

Tools Required:

• Tesla app or vehicle touchscreen
• Multimeter (for battery voltage testing)
• Basic hand tools for component inspection

Parts Required:

• Replacement 12V battery (if found faulty)
• Fuses (if any are blown)

Estimated Repair Time: 1-3 hours

Safety Warnings:

• Ensure the vehicle is powered off before working on electrical components.
• Always follow Tesla's guidelines for maintenance and repairs.