Tesla plans to sell its Model S and Model X electric cars with an option for a battery pack that squeezes more energy into the vehicles and will give the cars more driving range than previously offered.

The electric car company announced on Tuesday that it will sell a 100 kilowatt-hour battery pack for the performance versions of its Model S and Model X cars, which will enable those cars to drive 315 miles, and 289 miles respectively.

Previously, the most energy-dense battery that Tesla has been offering for its electric cars is a 90 kilowatt-hour battery, which will enable a high end Model S to drive close to 300 miles on a single charge.

While Tesla plans to offer the more energy-dense battery packs initially only for the Model S and Model X cars with “ludicrous mode”, now called the P100D, the company plans to make the 100-kilowatt hour batteries for its basic Model S and Model X cars down the road.

On a call, Tesla CEO Elon Musk said that it would be “several months” before Tesla could offer the 100 kilowatt-hour battery pack to more of its cars. That’s because the 100 kilowatt-hour battery pack currently costs more to make and is in limited production.

This article originally appeared on Fortune.com

Contact us at editors@time.com.

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