One of the great things about many hybrid and electric cars is that they're able to recharge the batteries a little bit every time you get off the throttle and use the brakes. You'll only get a little bit here and there, but over time, the electricity generated adds up. It also leads to a fascinating question: Exactly how big of a hill would you need to fully charge a Tesla?

To find the answer, Engineering Explained's Jason Fenske broke out his signature white board and did the math. To keep things as simple as possible, he chose a Tesla Model S 60 for this hypothetical scenario. But even with the Model S, which has the smallest battery pack, the height of the hill you'd need is more than twice as tall as Mount Everest. So theoretically it's possible, but in reality? Not really.

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Of course, if you have a Nissan Leaf, the battery pack is much smaller, so it might be close to fully charged by the time you got to the ocean from the top of Mount Everest. Then again, that also doesn't account for rolling resistance or drag. Nor does it account for the fact that a Model S 60 really has a 75 kWh battery pack. But it's still a fun thought problem.

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