USB power banks give your phone some extra juice on the go. You can find them in all shapes and sizes from various retailers, but why not build your own? [Kim] has a walkthrough on how to do just that ...

A hefty portable power bank is a handy thing to DIY, but one needs to get their hands on a number of matching lithium-ion cells to make it happen. [Chris Doel] points out an easy solution: salvage ...

With increasing functionalities and high processing powers, smartphones battery backup is reduced over time and a need of portable power bank increased with the time. In this project we are going to ...