The wrong charging techniques can also shorten a battery's life. Lithium-ion battery packs need to stay as close as possible to a 50 percent charge, he said, usually going no higher than 80 percent and no lower than 20 percent. Moreover, electric car owners should refrain from doing too many "fast charges," in which an EV battery can be recharged in under an hour.
"At high power, there is deformation of the material on a particle scale," Cugnet said. "If you're really in a hurry, it's OK to do it a few times," he said. "But most of the time, you should charge your car overnight."
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I thought the state of charge interesting.
Kirk
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