Power Stacker: Stackable USB Rechargeable Battery System

Please click below to visit our Kickstarter project page for Power Stacker and pre-order a production model!http://ift.tt/1IrUCvM Stacker is a portable, modular, USB rechargeable lithium-ion battery pack. Stack them toge...

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from Instructables: exploring - technology http://ift.tt/1vxJfIt