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Is this because the power on fast charges is too high and bad for batteries in the long run?
Battery temperature management seems to be a key limiting factor.
At least a few years ago, and likely still, the reasons and conditions under which the barrier layers in the battery degrade were not super well understood. Heat seems to be a key contributing factor and charging a battery quickly warms up the battery and I suppose not fully evenly within a cell. Not knowing the complete extent of this makes the early LEAF's lack of actively cooled battery a reasonable choice. Before that, the batteries of earliest Prius cars held up way longer than expected.
Like with a phone: heat and cold is not super awesome for the battery. It seems heat is especially bad for longevity.
Not "too high"technically. But does put more load on the battery, causing more dendritic growth in the cells.
Its not to high or bad for them, it's more like it just pushes the system to its max over and over. They are designed for fast charging.
Its like stretching a rubber band that can go to 3ft over and over. Its part of its design, but it will cause more wear and tear then just stretching it a few inches.
You're saying it's not too high or bad for them then you say it will cause more wear and tear. Which do you mean?
It's within specification, but it isn't optimal.