The source for the info is that literally only Apple makes a certified USB C to Lightning cable, which guarantees its power delivery specs and safety. Unlike Lightning cables which can be found certified at many places like Best Buy or from Amazon’s own brand, Apple has not certified any other USB C to Lightning cables besides their own and that means that iOS may detect the cable and not let the phone use it - you may have seen the message pop up before when using an uncertified lightning cable “This accessory may not be supported.” iOS is built to look for certified accessories so Apple can guarantee the safety and specs when using them with iOS.
This...also as posted on Apple @
https://support.apple.com/en-us/HT208137 and numerous articles including theverge
https://www.theverge.com/2017/11/3/...rging-usb-c-lighting-power-brick-cable-how-to
"If you want to get a USB-C to Lightning cable, you’ll need to get one from Apple. Full stop. Apple controls the Lightning side of the specification, and it hasn’t allowed third-party manufacturers to make their own USB-C to Lightning cables yet.
Given that this is a cable you’ll be plugging into a $1,000-plus dollar phone on one end and a high-powered charger designed to pass as much charge as possible in the shortest amount of time on the other, I cannot emphasize enough that I recommend you play it safe and stick with Apple’s offerings here.
Hopefully one day Apple will open up the floodgates and let authorized third-party Lightning to USB-C cables exist, but for now, you’re stuck with two options: Apple’s one meter cable, or Apple’s two meter cable."
I bought a power delivery from Amazon and the cable from Apple. Cable is surprisingly solid and heavy duty feeling. Charges 1-50% insanely fast. Then 50-100% is programmed to charge a bit slower for safety reasons. There may be some off brands that function okay for this purpose, but better to play it safe at this point IMO (it's a lot of power you're dealing with)
