how to replace the 12V battery in my Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Tools Required: Socket set, torque wrench, multimeter, flathead screwdriver.
• Disconnect the main battery by ensuring the vehicle is in "Off" mode and the key fob is out of range.
• Wear safety gloves and goggles.

2. Remove the Frunk Liner

• Use a flathead screwdriver to gently pry off any plastic clips securing the frunk liner.
• Carefully lift the frunk liner to expose the 12V battery compartment.

3. Disconnect the Existing Battery

• Locate the 12V battery; it is usually secured by a bracket.
• Use a socket set to remove the bolts securing the battery terminal covers (positive and negative).
• Disconnect the negative terminal first, followed by the positive terminal to prevent short circuits.

4. Remove the Old Battery

• Unscrew the bracket holding the 12V battery in place.
• Carefully lift the old battery out of the compartment, ensuring to handle it with care due to its weight.

5. Install the New Battery

• Place the new 12V battery into the compartment.
• Secure the battery using the bracket and bolts, ensuring it is firmly in place.
• Connect the positive terminal first, followed by the negative terminal. Ensure connections are tight.

6. Reinstall the Frunk Liner

• Reattach the frunk liner and secure it with the plastic clips removed earlier.
• Ensure everything is properly aligned and secured.