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I've been an enthusiastic user of #powerbanks for more than a decade now I think. I started off with a small 2600 mAh I had ordered from #DealeXtreme a long time before most people around me had even heard of them, and nowadays I always have 10,000mAh one in my jacket pocket, and pack 2-3 when I go on longer trips, so I have a fresh one while the other is charging on an outlet.
Leaving a #powerbank at a public charging station is far less risky than my phone.
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and data theft isn't the only risk when plugging in a random #USB device.
Meet the #USBKiller: https://fossbytes.com/usb-killer-version-2-0-is-here-to-burn-and-destroy-your-computer/
a USB device that sends a negative 220 Volt power surge over the signal wires, capable of frying a computer.
USB Killer Version 2.0 Burns and Destroys Your Computer

The maker of USB Killer is here with the USB Killer Version 2.0 - a more advanced version of the computer frying USB drive.

Fossbytes