how to tell if Tesla Model S Original (2012-2020) battery is bad

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

4-8 hours

Time

hard

Difficulty

high

Severity

3 min read

537 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix battery issues in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

4-8 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the electrical systems to avoid electric shock.
•Allow the battery to cool before handling it to prevent burns.

Symptoms

•Decreased driving range compared to previous performance
•Frequent need for recharging
•Battery Health warning displayed on the dashboard
•Slow charging or charging stops unexpectedly
•Increased battery temperature during charging or operation
•Unusual noises or vibrations from the battery area

Diagnostic Steps

1
Connect an OBD-II scanner to check for any error codes related to the battery management system.
2
Review the battery health report through the Tesla app or vehicle display to assess the state of charge and capacity.
3
Inspect the battery for physical damage or signs of swelling.
4
Monitor the charging cycles and times to see if there are inconsistencies.
5
Use a multimeter to measure the voltage of the battery cells to identify imbalances or weak cells.
6
Perform a range test to determine actual driving range compared to the factory specifications.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Torque wrench
•Basic hand tools (sockets, wrenches)

Parts Required

•Replacement battery pack (if faulty)
•Battery terminal connectors (if corroded)

Related Faults

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Symptoms

•Decreased driving range compared to previous performance

•Frequent need for recharging

•Battery Health warning displayed on the dashboard

•Slow charging or charging stops unexpectedly

•Increased battery temperature during charging or operation

•Unusual noises or vibrations from the battery area

Diagnostic Steps

1
Connect an OBD-II scanner to check for any error codes related to the battery management system.
2
Review the battery health report through the Tesla app or vehicle display to assess the state of charge and capacity.
3
Inspect the battery for physical damage or signs of swelling.
4
Monitor the charging cycles and times to see if there are inconsistencies.
5
Use a multimeter to measure the voltage of the battery cells to identify imbalances or weak cells.
6
Perform a range test to determine actual driving range compared to the factory specifications.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface and the battery is at a safe level to work on.
Gather tools including a multimeter, torque wrench, and any necessary protective gear.

2. Battery Inspection

Sub-step 1: Open the vehicle's trunk and remove any covers to access the battery compartment.
Sub-step 2: Visually inspect the battery for any signs of leaks, corrosion, or physical damage.
Sub-step 3: Check all battery connections for tightness and signs of wear.

3. Battery Replacement (if necessary)

Sub-step 1: Disconnect the negative terminal of the battery to ensure safety.
Sub-step 2: Remove the battery pack according to Tesla’s service manual. This typically involves unbolting the pack from its mounts and disconnecting various connectors and cables.
Sub-step 3: Install the new battery pack by reversing the removal steps. Ensure all connections are secure and properly torqued to the specifications provided by Tesla.

4. Final Checks

Sub-step 1: Reconnect the negative terminal and ensure all connections are tight.
Sub-step 2: Power on the vehicle and monitor the battery status on the display for any warnings.
Sub-step 3: Conduct a test drive to confirm that the vehicle is operating normally and that the battery performance has improved.