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When Tesla owners think about batteries, they usually focus on the large pack powering the car. However, every Tesla also has a standard 12-volt battery that runs smaller systems just like in regular cars. While Tesla drivers keep an eye on their main battery carefully, the 12V battery can fail without warning which can leave you stranded even with a charged main battery.
Understanding the Dual Battery System of the Tesla
Tesla cars have two separate battery systems. The main high-voltage battery powers the motors and has an 8-year warranty. The smaller 12-volt battery operates the door locks, computers, lights and other basic functions. This smaller battery is charged from the main pack or Tesla solar battery instead of by an alternator as in petrol or diesel cars. This setup can cause a problem - if the 12V battery fails, the entire car can become unusable and can even prevent you from getting into the car or charging the main battery. The Tesla system protects the main battery by sometimes entering a sleep mode that stops charging the 12V system when power gets too low. When this happens, the 12V battery can fail completely within a day.
Signs Your Tesla 12V Battery Needs Replacement
You might need a new 12V Tesla battery if you notice trouble getting into your car, warning messages on the screen about the 12V battery, strange behaviour from climate control or door handles or random error messages. Regular cars will show obvious signs like slow starting but the Tesla's warning signs can be subtle until the battery fails entirely.
Battery Options for Different Tesla Models
Older Model S vehicles (before 2015) used traditional AGM batteries similar to those in luxury petrol or diesel cars. The Model 3 and Model Y started with sealed AGM batteries, but newer versions use lithium-ion 12V batteries that last longer but need special charging equipment. Model X cars use larger AGM batteries with more capacity. The newest Model S and Model X (after 2021) use lithium-ion 12V batteries, which last longer but cost more to replace. The Tesla battery replacement price is around £50 to £100.
Factors That Affect Battery Wear
Very hot or cold temperatures can make batteries deteriorate faster, and if you leave your Tesla unplugged from the Tesla solar battery for long periods it can drain the battery since the main pack can't keep charging the 12V battery. Features like Sentry Mode and cabin protection constantly use power from the 12V system, and this can reduce the lifespan of the battery.
Maintaining the 12V Battery of Your Tesla
To make your 12V battery last longer, keep your Tesla plugged into a Tesla solar battery when parked for extended periods because this lets the main battery support the 12V system. For standard range models with LFP batteries, charge to 100% regularly to maintain proper voltage in both battery systems. Consider turning off features like Sentry Mode when they're not needed, especially during long periods of non use. Keep an eye on the health of your battery through the service menu on your touchscreen. For older models with traditional batteries, look for corrosion around terminals.
Protyre's Free Battery Check Service
Our free check examines the starting and charging systems, and our technicians examine physical elements like cable quality, terminal cleanliness and mounting security along with electrical performance. For traditional batteries, they also check fluid levels. Regular professional testing can help to identify batteries near to failure before they stop working. With over 180 local garages throughout the UK, our experienced technicians can tell you what the Tesla battery replacement price is and whether it is needed.
Frequently Asked Questions
The 12V battery on your Tesla can be tested at any Tesla Service Center during regular servicing, but it can also be tested at independent garages with the right equipment, such as Protyre garages. At Protyre, we also have a wide range of tyres for your Tesla from top brands like Falken and Bridgestone. You can select and buy your tyres online by using your car registration by searching for the tyre size.
The cost of battery replacement for a Tesla is around £50 to £100 and upwards, depending on the brand of the battery and where you get it fitted. The Tesla battery replacement price may also include fitting fees.