Tesla Model S 12V Battery Replacement

A Tesla Model S 12-volt battery replacement can cost between $0 and $400, one of the least expensive repairs you might need.
Written by Jennifer Justice
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If your Tesla Model S needs a new 12-volt battery, it can cost between $0 to $400, depending on whether the battery is still under warranty.
The
Tesla
company is one of the most famous manufacturers of electric vehicles, and it certainly provides a lot of competition for other EV brands. While you don’t have to make regular stops at a gas station, you still need to consider maintenance. Since the Model S uses a 12-volt battery with a four-year/50,000-mile warranty, your battery might be under warranty.
Since Tesla owners report that the 12V battery is dying faster than anticipated, you might need to replace it. Luckily, this article will guide you on replacing your 12V battery, and will also cover how the Model S compares to Tesla’s other vehicles.
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How much does it cost to replace a Tesla Model S battery?

Fortunately, the 12V battery for a Tesla Model S is pretty reasonable at $0 to $400, especially compared to lithium-ion battery replacements.
Your battery has a four-years/50,000-mile warranty on it, so it might be under warranty and cost you nothing to replace it. Check with Tesla before you make a decision. The 12V battery powers things like unlocking the door before you turn on the engine, and the battery is supposed to last you several years. However, Tesla owners have reported the batteries are dying much faster than expected and sometimes often need replacing within a year.
If you need to replace the battery outside of warranty, it could cost you up to $400, plus up to $100 for labor, especially if you choose a Li-ion battery option. Tesla states that only AtlasBX / Hankook 85B24LS 12V 45Ah batteries are compatible, and you should avoid using anything else because of the potential to damage the equipment. Contact Tesla about getting the replacement because trying to use something outside the recommended battery or making modifications can void your warranty.
Considering that the Li-ion battery packs that power the engine are usually thousands of dollars to replace, the 12V battery is a much cheaper fix.

Can you put a new battery in an old Model S?

Since the 12V battery is one of the simplest batteries to replace, comparatively speaking, you have options. Tesla’s owner's manual states that you must use an AtlasBX / Hankook 85B24LS 12V 45Ah compatible battery, a traditional lead-acid battery. However, Tesla is also working on upgrading the 12V to a Li-ion option because they last much longer. If your battery is still under warranty, Tesla will determine which option they use when they replace your old battery.
Don’t go to your local hardware store and grab the first 12-volt battery you can find, however. You could damage your Tesla, while modifications outside the recommended equipment result in a voided warranty, which you don’t want.
While 12 volts usually last three to four years in a traditional gasoline-powered vehicle, they die within about a year’s time when used for EV cars. Most Tesla owners are trying to get the newer 12-volt Li-ion battery, so your Model S could end up with the new option depending on what the Tesla service center uses as a replacement. 
The new battery has a warranty of eight years/150,000 miles, but it is more expensive—it can cost up to $400. Considering the much shorter life span of the old lead-acid battery and the need for continuous maintenance, the potential added cost could be worthwhile.

Tesla Model S battery capacity and range 

If you’re wondering how the Tesla Model S compares to other models, check out the table below on battery capacity and
driving range
Model years
Battery capacity
Driving range
2017
75 kWh
259 miles
2018
75 kWh
315 miles
2019
75 kWh
285 miles
2021 Plus
50 kWh
271 miles 
2022 Plaid
100 kWh
396 miles
2022 Performance
100 kWh
405 miles
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How long does a Tesla Model S battery last?

The original version of the 12-volt lead-acid battery has a four-year/50,000-mile warranty, but they last only about a year based on owners’ experiences. 
Batteries seem to be draining a lot faster than expected, so this is one reason Tesla is switching to a Li-ion battery for the 12-volt. They also have a software update to help with the issue, so if you haven’t updated your software in a long time, be sure you do. 
Since the battery powers everything while the engine is off, like the lights, windows, and even the locks, what you do when the car isn’t pulling energy from the main battery matters. You can use a few simple steps to prolong your 12-volt battery:
  • Avoid using electronics when the engine is off: since the 12-volt battery powers everything electronic while the engine is idling or off, doing things like using your phone while it’s plugged into the Tesla console or running the air pulls power from that battery. Minimize using electronics while the car is off.
  • Don’t let your main battery charge get too low: the battery pack that powers your engine also gives power to the 12-volt battery. If you let the main battery charge get too low, it can damage both batteries, which can also void your warranty.
  • Update your software regularly: Tesla released software updates to help with the 12-volt battery problem. Let your Tesla and the app update automatically so you don’t miss something important.
  • Don’t leave the lights on: if you’re not in the car or don’t need the extra light, avoid keeping the overhead lights on. This drains the battery, and if you leave the lights on overnight, you might come back the next day to a dead battery, just like any car.
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