A few months ago I bought a Shelly Gen4 Presence sensor, direct from their store on Aliexpress.

It worked well, though I noticed it did occasionally run VERY warm.

While it was being powered off the USB-A port on a multi port USB charger, the charger has always worked perfect well and delivered consistent voltages. I needed to use a longer USB cable (2.5m) to reach the area I was placing it, and as such it looks like there was a slight amount of voltage drop on the cable, but nothing crazy, and it seemed to be working fine until the day I stumbled upon it's smoking corpse.

Shelly are now fighting me on this and claiming that just because my charger can do 100w using a usb-c to usb-c cable, they are confused and think it's somehow possible for it to do 100w over a usb-a to usb-c cable, despite the attached picture of a USB multimeter demonstrating that port / cable delivering....…