Replace Tesla Low Voltage Battery: Quick & Easy Steps!

Last updated on September 21st, 2023 at 09:38 am

The 12-volt low-voltage battery of Tesla is the vehicle component responsible for powering the overall electrical system of the vehicle. 

As such, replacing the low-voltage battery is an important maintenance task that ensures the smooth operation of the vehicle’s electrical systems. 

The big question, however, that begs for an answer is, “How do I go about replacing the Tesla low-voltage battery”?

To replace the Tesla low voltage battery, first locate the battery position, which is usually in the front trunk of the vehicle. However, you must loosen the black negative cable bolt before unmounting it from its bracket mount. Then, proceed to loosen the red positive cable and the wiring harnesses.  

It is common to notice that your Tesla wouldn’t start; in such a scenario, don’t panic; it could just be the case of a low-voltage battery. 

And if that is the case, replacing the battery is doable and will save you some cost. Let’s go through the step-by-step process of how to replace Tesla’s low voltage.

How to Replace a Tesla Low-Voltage Battery (Step by Step)?

Replace Tesla Low Voltage Battery

Replacing a Tesla low-voltage battery is not challenging. On the contrary, it is a relatively straightforward task you can easily do yourself. 

All you require is to understand and carefully follow the manufacturer’s guidelines, as stated in the vehicle instruction manual on replacing low-voltage batteries. 

Below is a step-by-step guide on how to replace a Tesla low-voltage battery. 

  • The first step to replacing a Tesla low-voltage battery is to disconnect the negative terminal of the 12-volt battery to prevent any electrical mishaps. 
  • Locate the Tesla low-voltage battery, which is usually in the front trunk area of the vehicle. 
  • Ensure to remove any compartments, panels, or covers that may obstruct full access to the battery.
  • You can then disconnect all the wiring harnesses/terminals connected to the battery for easy removal. 
  • It is important at this point to take note of the specific connection points for reinstallation. 
  • You can do that by simply taking a snapshot of the connection before disconnecting them.
  • After detaching every connection terminal, remove the old battery from its bracket mount. 
  • Inspect the bracket mount before installing the new battery and clean any accumulated debris or corrosion. 
  • Once the bracket mount of the battery is clean, place the new battery into position and secure it properly. 
  • Reconnect the terminal connections in the correct position as they were on the old battery. 
  • Double-check every connection terminal for proper connection to avoid any potential issues.
  • Reconnect the wiring harnesses/terminals you removed to the new battery. 
  • And lest you forget, after reestablishing all the connections, remember to reconnect the negative terminal of the 12-volt battery. Viola, you’ve done the job.
  • Finally, reset the vehicle’s computers to recognize the new battery.

Can You Replace a Low Voltage Battery With a Lithium Battery?

Replacing a Tesla low-voltage battery with a lithium one is not wise. Using a lithium battery to replace the low-voltage battery of your Tesla can result in far-reaching consequences. 

Tesla vehicles have specific batteries compatible with their electrical and electronic systems. 

Working with different voltage components in Tesla can be dangerous. A different type of battery can cause a great degree of damage to the vehicle.

Tesla usually undergoes extensive testing and certification processes to ensure the functionality and safety of their battery with the vehicle system. 

Replacing the low-voltage battery with a lithium battery can cause damage and malfunction in the vehicle systems.

In the same vein, replacing Tesla’s low-voltage battery with a lithium battery will compromise the safety features and protections of the vehicle. 

Most importantly, modifying any component of a Tesla vehicle, including low voltage battery, voids every warranty. 

Therefore, when it comes to replacing the low voltage battery of Tesla vehicles, it is recommended to strictly follow the manufacturer’s guide. 

While you may attempt to replace the low-voltage battery with a lithium battery, it isn’t the best option. It is best to stick with Interstate or Optima to keep your Tesla warranty

As such, you should not attempt replacing a Tesla Voltage battery with a lithium battery, especially outside recommendations.

In addition, since the design of Tesla vehicle systems is specific, their performance is optimized to work with specific battery systems

Therefore, replacing a Tesla component with a different type may affect the vehicle’s performance, driving experience, and overall efficiency. 

How Often Do Tesla Low Voltage Battery Require Replacement?

Tesla’s low-voltage battery, unlike other components, typically does not require frequent replacement. 

The 12-volt battery of Tesla is responsible for powering the vehicle and various other components such as the auxiliary systems, infotainment system, and lights. 

As such, the 12-volt battery has a long lifespan to serve the vehicle for several years before needing replacement. 

However, there’s no certainty how long the low-voltage battery will serve before replacement. 

Over time, electric vehicles’ battery capacity degrades, resulting in low performance and other potential electric issues. 

The lifespan can vary depending on the numerous factors that affect the usage. For instance, the degree of usage can positively or negatively affect how long the low-voltage battery will last. 

In like manner, factors such as climate conditions also affect the battery’s lifespan.

Extreme hot temperatures and deep charge-discharge grossly contribute to the deterioration of the battery’s health.

Maintenance practices also greatly affect how often you may need to replace the low-voltage battery. 

The best practice for knowing when to replace your Tesla low-voltage battery is to monitor the battery’s health and performance regularly. 

You can monitor the low-voltage battery health and performance through the Tesla onboard diagnostics systems. 

If you suddenly notice any issues or signs of deterioration, consult the Tesla service center for further evaluation and recommendation. 

Below is an estimate of various Tesla models’ Voltage Battery warranty.

Tesla Model Low Voltage Battery Warranty 
Tesla Model 38 years or 100k miles
Tesla Model Y8 years or 120k miles
Tesla Model X8 years or 150k miles
Tesla Model S8 years or 150 miles

What Happens If I Fail to Replace My Tesla Low Voltage Battery?

When you fail to replace your Tesla low voltage battery when need be, it can lead to various issues and, inevitably, the vehicle’s malfunction. 

To fully understand what will happen if you fail to replace your Tesla low-voltage battery, you must understand its function.

The low-voltage battery of Tesla vehicles is responsible for powering essential systems of the vehicle. 

Every electrical component, auxiliary system, infotainment system, and light of a Tesla vehicle receives power from the low-voltage battery.

Therefore, you’ll likely experience problems starting your vehicle if the low-voltage battery is weak or dead. 

Also, the vehicle’s touchscreen will not turn on, or the car’s lights will probably not work. 

Additionally, you will notice that the vehicle’s software doesn’t update correctly in the long run. 

Furthermore, you will encounter errors and some glitches in the system, affecting your Tesla vehicle’s reliability. 

All the aforementioned affects the driving experience of the vehicle, and as such, it is best to replace the low voltage battery when due.

It is worth noting that the low-voltage battery is separate from the main high-voltage battery that powers the vehicle’s drive system. 

Nevertheless, both batteries work together for the smooth operation of the vehicle. 

Regular checkup is a way to elude all the issues that may result from not replacing your Tesla low-voltage battery in time. 

Therefore, if your low-voltage battery needs replacement, do well to replace the battery as soon as possible. 

Also, Tesla vehicles have specific safety precautions that you need to follow to ensure the vehicle’s smooth running. 

You can consult a certified Tesla officer or service to diagnose and properly address any issues with the battery.

What Are the Recommended Replacement Intervals for Tesla Batteries?

Tesla batteries have lengthy recommended replacement intervals, meaning there is no need to replace Tesla batteries often. With regular maintenance and optimal charging habits, Tesla owners can expect their batteries to last for many years. This not only ensures reliable performance but also contributes to the longevity of the vehicle. So, there is no need to worry about having to replace tesla battery often.

What Does It Cost to Replace a Low Voltage Battery?

Generally, it will cost about the range of $500 to $1500 to replace your Tesla low-voltage battery with a new one. 

However, the cost can be less depending on the factors affecting the cost of getting a new low-voltage battery.

To begin with, the cost to replace a Tesla vehicle’s low-voltage battery varies with the vehicle’s model and year. 

Also, how much it’ll cost you to replace your Tesla low-voltage battery depends largely on the specifications of the battery

The battery type, size, and cold cranking amps ratings all fall under the battery specification that affects the cost of the battery.

You can look up the specs of your Tesla model low voltage battery as listed in the vehicle manual.

In addition, the installation cost is part of the overall cost of replacing the Tesla low-voltage battery.

The good news is that you don’t need to break your bank to replace the 12-volt low-voltage battery of your vehicle.

However, spending a little more upfront on a high-quality, properly rated battery will give you the peace of mind you desire. 

Ensuring your Tesla continues running smoothly, safely, and efficiently for years is worth the replacement cost.

It’ll interest you that Tesla service centers charge a premium for the new battery and installation costs. 

You can check for the accurate cost estimate of the low-voltage battery for your Tesla vehicle at any Tesla service center.

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