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Only the usb c to lightning cables experienced the behaviour described which is why I assumed it was something to do with the mfi. This is the socket in question and it supports usb PD over the C port https://www.screwfix.com/p/lap-13a-2-gang-sp-switched-socket-3a-2-outlet-usb-char...
Milwaukee products are new at Screwfix so we've picked the three best for the DIY kingpin, plus a new camera for the security-conscious There's a really good reason: Besides the fact that USB cables are relatively easy to find these days, USB has a really robust, well-defined charging ...