Tesla Model 3 12v Battery Replacement Cost

a 12v battery for tesla model 3

When you take delivery of your brand new Tesla Model 3, the car works like a dream. However, with continuous use, the car starts to suffer wear and tear and requires repairs and replacements.

One of the parts that may require a replacement is the 12v battery. In this article, we look at the cost of replacement for the Tesla Model 3 12v battery. However, we will start with what the 12v battery of a Tesla Model 3 does.

What does the Tesla Model 3’s 12v battery do?

Your Tesla Model 3 contains a massive battery pack known as the traction battery or pack. It powers the electric motor(s) that produce automotive force. However, there is a much smaller 12v battery or the secondary battery.

The larger battery is only for the drive motor, while the 12v battery powers everything else. The items powered by the smaller battery include lights, wiper motors, window motors, power steering, AC, heater, and electronic system, including the in-car entertainment system.

The traction battery is 400 V, making it impractical to run anything apart from the electric motor in the car. Instead of lithium-ion, Tesla uses a lead-acid as the 12v battery. This is because lead acid batteries can tolerate and work at extreme temperatures. The 12v battery is located in the front left corner under the hood.

How much does it cost to replace your Tesla Model 3 12v battery?

The cost depends on when you need to do the replacement and where you are sourcing the replacement 12v battery from. If your Tesla Model 3 is still under warranty, the cost to replace the 12v battery is zero. However, the story is different if you do not have a warranty cover.

You may spend between $100 and $500, including the cost of parts and professional labor. A high-performance 12v battery costs more, so if you upgrade your Model 3’s electrical demand, you may have to pay more for your replacement battery.

You can shop for a 12v battery on Amazon, where you can compare prices and brands. You can also shop in a physical store. The cost of the 12v battery varies from one brand to another. Note that the 12v battery is not made by Tesla, but you shouldn’t have any problem finding a suitable replacement.

Why do you need to replace your Tesla Model 3 12v battery?

There are several reasons you may want to replace the 12v battery in your Model 3. For example, the original battery may be damaged or old. Lead acid batteries last between 3 and 5 years. Also, if you want to modify your car in a way that requires additional electrical power, e.g., installing a custom sound system, you may need to install an upgraded 12v battery.

How long does the 12V battery last in a Tesla Model 3?

How long does the 12V battery last in a Tesla Model 3? The 12V battery in a Tesla Model 3 can last for 3-5 years or every 42000-70000 miles.

This battery is responsible for powering the car’s lights, infotainment system, and other electronics. It is important to keep an eye on the health of this battery, as it can give you an early indication of any potential issues with your car.

There are a few things that you can do to prolong the life of your 12V battery, such as:

  • Preconditioning the Tesla battery
  • Keeping your car’s lights turned off when you’re not using them
  • Unplugging any unnecessary electronics when your car is not in use
  • Make sure that your Teslas infotainment system is turned off when you’re not using it If you take good care of your 12V battery, it should last you for many years to come.

What is the Tesla Model 3 12v battery replacement size?

The size of the 12v replacement battery on your Model 3 depends on the type or version of your car. For example, the entry-level Model 3 uses a 51R battery. If you are in doubt or if Tesla updates its battery requirements, you should contact the company to ensure you get the correct battery.

Can I replace my Tesla Model 3 12v battery myself?

The answer is yes, as Tesla has released guides on DIY maintenance. However, if you do not have the tool, skill, or time, you can drive to a service center, or an authorized Tesla mobile technician can come down to where you are. You must note that this will increase the cost of your battery replacement.


The Tesla Model 3 uses a 12v lead acid battery, even though it is an electric car. The cost of replacing the 12v battery varies, but you may expect to spend between $100 and $500. However, you must ensure the replacement 12v battery works with the Tesla Model 3.


Jimmy Mitchell is an electric vehicle aficionado who has been following the space since Tesla first hit the scene. A longtime proponent of sustainable transportation, Jimmy was one of the first to buy a Tesla 3 as soon as it came out. He loves nothing more than helping others learn about and enjoy the benefits of electric vehicles. When he's not evangelizing about EVs, Jimmy enjoys spending time with his family and travelling throughout south east asia

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