Many conventional lithium-ion batteries that power electronics today use the format called “18-650,” which stands for 18 millimeters in diameter and 65 millimeters in length (the zero in the name is just an add-on). Tesla has used these batteries to power its Model S and Model X electric cars.

However, Tesla’s Gigafactory, which is supposed to produce its first battery cells by the end of this year, plans to produce a new format of lithium-ion batteries called the “21-70.” That stands for 21 millimeters in diameter and 70 millimeters in length.

These batteries will be wider and longer, holding more raw materials inside, and would be used in Tesla’s Model 3 electric car. That car is supposed to cost $35,000 and be out by the end of 2017. Panasonic will produce the 21-70 batteries in the Gigafactory for Tesla.

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