eBay keyring phone-killer

This is unfortunate.  It's a well designed miniature keyring power bank that has a design flaw that means a simple factory error can result in it damaging equipment it is plugged into.
Some phones do seem to have protection against reverse polarity, but many USB charged items will be damaged by this device.

The manufacturing error won't affect all of these units, but it definitely affects the one that I bought.  It's fortunate that the first thing I plugged it into was a Ruideng USB test meter which appears to have reverse polarity protection .

First charge cycle of the lithium cell indicates a capacity of 600mAh.  Which is better than I was expecting, but well short of the 1500mAh stated on the eBay listing.  (Which is completely normal for eBay these days.)

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#ElectronicsCreators

• #science_technology
• #usb
• #power
• #bank
• #keychain
• #phone
• #killer