According to Digital Trends, the base price of Tesla Model S and Model X electric cars is about to shoot up. Customers have until January 13 to order cars with the smaller (and less expensive) battery pack. Tesla has reshuffled battery-pack options for the Model S and Model X multiple times. This change means both cars will now be available with only Tesla’s largest 100-kWh battery pack. The base price of the Model S is set to jump from $77,200 to $95,200,.