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For a variety of reasons, DCFC degrades the high-voltage Li-ion battery faster - i.e., it loses it's ability to retain and deliver a charge compared to its earlier "newer" state, usually expressed as capacity fade over time on a linear scale ("fast charging" does the same thing to your Li-ion household appliance batteries as well). Whether it's significant in the life cycle of the car needs more data (how much more degradation vs "slow" L2 charging, comparing identical batteries charged differently over months and years?). No essential difference in the chemistry of "charging," other than the speed of the reaction(s) and the additional generation of heat using more voltage, and it's effect on the internal components of the battery (a little more technical discussion than is warranted here). Suffice that "fast" charging is worse for the life/health/capacity of the battery, maybe a little worse, maybe a lot worse, depending.
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