How to Change a Tesla 12V Battery
Car Maintenance 

How to Change Tesla 12V Battery

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Got a warning that your Tesla’s 12V battery needs service? Don’t stress — it’s easier to fix than you think! First, power off your car properly through the screen. Pop the frunk open, remove a few plastic covers, and you’ll find the 12V battery tucked inside (front left for Model 3/Y). Here is a simple guide how to Change Tesla 12V Battery and it works similarly for Model S, Model 3, Model X, Model Y, with slight differences.

📋 General Tools You Need:

  • Socket wrench (usually 10mm socket)
  • Flathead screwdriver or plastic trim tools
  • New 12V battery (OEM Tesla spec — AGM or lithium depending on model/year)
  • Safety gloves (recommended)
  • Protective glasses (recommended)
Book inspection

🧭 Step-by-Step Instructions

1. Power Off the Car Properly

  • Sit inside → Controls → Safety → Power Off.
  • Wait a few minutes — car fully shuts down systems.

2. Open the Frunk (Front Trunk)

  • Use your Tesla screen or mobile app to pop the frunk.
  • If the 12V battery is already dead → you’ll need to use manual frunk release (behind tow eye cover at front bumper).

3. Remove the Top Covers

  • Remove the plastic covers over the frunk area (easy clips or bolts depending on model).
  • Find the HV (High Voltage) disconnect loop (usually orange-colored).

Important:
Disconnect the HV loop for safety if available (Model S/X mainly) before working on 12V systems.

4. Locate the 12V Battery

  • It’s typically:
    • Model 3/Y: front-left under the trim covers.
    • Model S/X: under more trim near the frunk.

5. Disconnect the 12V Battery

  • Remove the negative (-) terminal first.
  • Then remove the positive (+) terminal.
  • Unbolt the battery hold-down bracket (usually 10mm bolts).

6. Remove the Old Battery

  • Carefully lift it out. They are small but still heavy.

7. Install the New Battery

  • Place new battery in position.
  • Attach positive (+) terminal first.
  • Then attach negative (-) terminal.
  • Reinstall hold-down bracket.

8. Reconnect Everything

  • Reconnect the HV loop (if you disconnected it earlier).
  • Replace frunk trim and covers.
  • Close the frunk.

9. Power the Car Back On

  • Car should auto-restart when you open the door or press the brake pedal.

✅ Check on the screen for any error messages.
✅ Clear any 12V battery warnings.

Specific Notes by Model:

ModelSpecial Note
Model S (older)Traditional AGM battery, often in awkward location under panels.
Model 3/Y (newer)Now many use Li-ion 12V batteries → lighter and longer lasting.
Model XMore panels to remove but same principles.

🚨 Safety Reminders

  • NEVER short the battery terminals.
  • Always disconnect negative (-) first, reconnect positive (+) first.
  • If unsure, Tesla Service or Mobile Service can swap it for you — costs more, but 100% covered for warranty.

🛠️ Pro Tip:

Tesla now uses lithium-ion 12V batteries (not just lead-acid) in newer models — check your owner’s manual or check your existing battery before buying a replacement.

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