Dangerous USB-powered 18650 Li-Ion charger

Today, let's take a look at a cheap charger for 18650 Li-Ion cells. It's powered from a USB port, not mains, so it should be safe... or shouldn't it? Watch this video!

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The list of 18650 Li-Ion cells I've tested. Note how many of them say PROTECTED despite having no protection:
http://danyk.cz/test18650_en.html

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• #science_technology
• #dangerous
• #usb
• #18650
• #li_ion
• #charger