If you suspect that your Tesla Model S battery is bad, there are a few signs you can look for:
Reduced range: If your Tesla Model S battery is bad, you may notice a significant reduction in the car's range. You may need to charge the battery more frequently, and you may not be able to drive as far on a single charge.

 

Slow charging:

A bad Tesla Model S battery may take longer to charge than it used to. You may notice that it takes longer to charge the battery to full capacity or that the charging rate is slower than usual.

 

Battery warning lights:

If your Tesla Model S battery is bad, you may see warning lights on the dashboard, indicating that there is a problem with the battery. The warning lights may include a battery icon with an exclamation point or a message stating that the battery needs service.

 

Reduced performance:

A bad Tesla Model S battery can also cause a reduction in the car's performance. You may notice that the car is slower or less responsive than it used to be.

 

Strange noises:

If your Tesla Model S battery is bad, you may hear strange noises coming from the battery or the car. These noises could include whirring, humming, or buzzing sounds.

If you notice any of these signs, it's essential to have your Tesla Model S battery inspected and serviced by a qualified Tesla technician. They can diagnose the problem and recommend the necessary repairs or replacements to restore the battery's performance and efficiency.