Building the 3.7V Li-Ion battery charger. Construction of this charger circuit is undoubtedly a difficult exercise for many beginners and hobbysists because the task calls for perfect skill in SMD ...

The circuit’s built-in power supply has been kept very simple. The single-cell Li-ion battery (BAT) provides a nominal voltage on 3.7 V. The power supply also drives a “luxury” white LED light source ...

Maxim MAX8814 based battery charger Build A Smart Battery Charger Using A Single-Transistor Circuit by Ejaz ur Rehman is one of the most popular articles on ElectronicDesign.com .

Hit up tech weblog anythingbutipod for the simple diagram to make your own. The battery-powered USB charger isn't an altogether new idea. ... the classic Altoids-tin-gum-battery-powered charger.