DIY USB Battery Charger for Cell Phone Lithium Ion Batteries From a Wireless Mouse Charger : 4 Steps - Instructables
Amazon.co.jp: DIY Power Bank, 18650 Portable Charger with LCD Display, USB Micro Type C Mobile Battery Box for Cell Phone MP3 Laptop, Plug and Play (White) : Electronics
Portable 2 Ports USB Power Bank Case DIY 3x18650 Cell Phone Battery Charger Charger Power Bank Case Kit for iPhone Huawei Drop
Make your own portable phone charger with a BATTERY! (Demo) - YouTube
DIY Mobile Battery Charging Station for Workshop
How to Make an Emergency Mobile Phone Charger / DIY Power Bank - YouTube
How To Make a Portable USB Cell Phone Charger - YouTube