Rather than bore you with a long list, let’s take a look at what doesn’t use it and uses the high volt battery pack instead. You might be asking what parts of Tesla use the 12V battery. AGM batteries are also sealed, meaning there won’t be any liquid spills or corrosion. This will mean more charging cycles, and the particular AGM battery used in your Tesla is specifically designed to be repetitively charged and discharged on a regular basis. It needs to use a 12V battery to power the 12V systems and not to mention the fact that the car still needs to use the battery even when it’s not in use, like Sentry Mode, unlocking the car and being able to turn everything on quickly once you enter the car. So Tesla uses what’s known as Absorbent Glass Mat or AGM since Tesla doesn’t need to turn over a gas engine and doesn’t have an alternator and The design of the AGM battery is better suited for Tesla vehicles. If you were to use this type of battery in a Tesla, it wouldn’t last very long, at best, maybe a few months. Even when the gas car is powered off, it doesn’t need much energy from the battery. Once it’s started, the 12V battery really isn’t used that much since the alternator powers the 12V accessories in the car. The 12V battery in a gas car is used primarily to give a jolt of high current energy to turn over the engine for a few seconds. So if you drive a Tesla that is older than the new 2021 Model S or X, most likely, your 12-old battery is going to need to be replaced soon. Essentially, your battery shouldn’t need to be changed quite nearly as often and should essentially last the same amount of time as your main battery pack. In fact, in an interview with Sandy Monroe, Elon did acknowledge that in their new refreshed vehicles for Model S and X 2021, and probably later, they’re going to be changing their 12-volt battery to a lithium-ion battery. Many in the community have seen their 12-volt batteries die on them with no warning sign whatsoever which could cause you to be locked out of your vehicle and essentially stranded.Įlon did address that they would be solving this by giving customers a heads up when their 12-volt battery is going to die, but that doesn’t address the problem and how to resolve it until their most recent 2021 Model S and X refresh. In fact, Tesla had a reoccurring issue with its 12-volt batteries. If you’re frequently tapping into your battery bank, that could mean that your batteries may need a replacement in less than two years. Lead batteries are good for about 500 to 1000 cycles as the best deep cycle. Not only that, but lead batteries have a limited cycle life. What’s the difference between these two?įor starters, lead-acid batteries are far cheaper than lithium-ion batteries up front, but over the course of the batteries’ lifetime, lithium-ion batteries make far more sense. So the 12V battery in my Tesla must be lithium-ion like my high volt battery, right? NOPE! Much like that of a gas-powered car, your Tesla has a lead-acid 12V battery (minus the refreshed 2021 S & X). This is one of the reasons why a 12V battery was added to the gen 2 Roadster and every other Tesla up to this point. The problem with that is if the high volt battery needed to be powered down, such as after an accident, all of the 12V systems shut down as well as safety features, like the hazard lights, no longer worked. Instead, a DC to DC converter was used to take energy from the main battery and power the 12V system, such as the headlights, turn signals, media controls, etc. When the first-gen Roadster was designed, it actually didn’t have a 12V battery. Obviously, the big difference between an EV and a gas-powered car is the lack of an engine, but when you pop the frunk of your Tesla, you still have access to things, like brake fluid, washer fluid and even a 12V battery.įor some people, it may have come as a surprise that their Tesla even has a 12V battery, especially since there is a high volt battery that could easily provide all the energy they need for their 12V systems. If you’re like a lot of car owners, you probably don’t pay much attention to what’s under the hood. Why does your Tesla have a 12V battery when it has access to a gigantic battery under the floorboard of the car? Let’s get into it. Why Does Your Tesla Have A 12V Battery?.
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