On Friday, Tesla launched its more affordable $35,000 car, the Model 3. The thing that's been keeping these cars so expensive is because of the batteries it requires. Teslas have a long range of 200+ miles, which means it needs bigger batteries. Tesla has put batteries in the chassis for this, which is a good place to put them because it gives the car more stability and keeps it out of the way. The price of these batteries has been dropping considerably, though.