They make these things now. 

"XJDano" (xjdano) 03/30/2017 at 14:01 • Filed to: Tools

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It converts my Bosch power tool 18v battery’s to 2 USB power ports. Pretty slick.... well the one I bought was $13.

POWERAXIS USB Power Source 14.4V 18V 11.3-22V DC for Bosch BAT607 BAT609 Power Tool Battery Phone USB Devices Charger Adapter

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benjrblant > XJDano 03/30/2017 at 14:05

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Convenient tool, or conspiracy to get you to purchase and burn through more batteries?

XJDano > benjrblant 03/30/2017 at 14:09

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Most likely yes.

Urambo Tauro > XJDano 03/30/2017 at 14:33

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Ah, so it uses the tool battery as a power source. For a minute there, I thought it was a way to charge tool batteries from a USB port.

Lumpy44, Proprietor Of Fine Gif > XJDano 03/30/2017 at 15:14

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I have the Dewalt one for my 20v batteries, pretty slick for camping! The new Black and Decker have it built in!