I recently purchased an iPhone X, and along with it I also purchased a 29W USB-C Power Adapter and a USB-C—Lightning cable. This setup is supposed to enable Fast Charging of the iPhone X.
However, always when plugging in the iPhone X to this setup, the phone gives a way the "charging" sound notification twice. Is this normal behaviour?
I don't get the double sound notification when plugging in via normal Lightning-to-USB-A to another 12W adapter, nor when connecting the phone with a Mac.
I'm thinking the second sound notification may have something to do with switching over to Fast Charge, but I haven't been able to find a definite answer. Or perhaps some component is faulty?
This thread (external link) has people asking the same thing: https://forums.imore.com/iphone-x/396144-fast-charge-apple-ac-adapter-cable-double-sound.html