I was worried about heat with rapid charging but it isn't there with my phone, a Pixel 2, or with my Chromebook, an Asus C302. I check both the charging block and the phone for heat and there is no increase. It's not unusual that I use my Pixel while it charges. Plus, if I were concerned, I would use a cheaper charging device and do painfully slow charging. USB c is superior on other counts besides rapid charging but most don't apply to Kindle. File transfer is faster. I'm no engineer or geek but I like USB c.
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