There is another way that this can be dangerous.
I give you [USBKIll](https://usbkill.com/) – turning an innocent USB charging cable into a potentially lethal (to your device) attack. Unless you put another device between you and the ‘killer USB’, or your device has an optocoupler built in (fancy for disconnecting the raw voltage of the USB port from the mainboard by converting the signal from +/- 5V to light pulses) then you may find the magic smoke escaping shortly thereafter. Or worse, causing a catastrophic failure of your battery and a runaway fire
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