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In designing, testing, and producing the Nissan Leaf, the first modern electric car sold in volume, Nissan made a design decision that some other companies didn't.
It chose not to build an active thermal-conditioning system (otherwise known as cooling) into its battery pack.
Instead, it relies on ambient air to shed heat—which got the maker into trouble with owners in very hot climates like that of Phoenix, Arizona, where asphalt temperatures can reach 140 degrees F or more in the summer.
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Nissan later switched to a more heat-resistant battery chemistry, informally known as "lizard cells," but many earlier Leafs have experienced significant battery capacity declines.
Some of those, however, are not quite enough to hit the 70-percent mark within five years, meaning that Nissan's battery-capacity warranty is no longer in effect.
Nonetheless, owners can sometimes bargain with Nissan and their dealership to get concessions on a replacement battery pack.