While there is research that shows that frequent fast (DC) charging can somewhat degrade the battery faster than AC charging, the effect on battery heath is very minor. In fact, DC charging only increases battery deterioration by about 0.1 percent on average. 

Treating your battery well has more to do with temperature management than anything else, as lithium-ion (Li-ion) batteries are sensitive to high temperatures. Luckily, most modern EVs have built-in temperature management systems to protect the battery, even while fast charging. 

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