5V 1A USB Lithium Li-ion 18650 3.7V Battery Charger Module Board DIY Power Bank | eBay
DIY - Battery Powered USB Travel Charger
Simple 12 Volt Battery Charger Circuit Diagram
DIY battery charger. Portable and very convenient. Only has one cord because it has a power strip inside. All chargers bolted down also. : r/somethingimade