Overcharging protection for Portable devices (Laptop, Mobile, MP3 player etc) using Arduino and RTC DS1307
Amazon.com: 10pcs Smart Electronics 5V Micro USB 1A 18650 Lithium Battery Charging Board with Protection Charger Module for Arduino DIY Kit : Electronics
Smart Electronics 5V type c Micro USB 1A 18650 Lithium Battery Charging Board With Protection Charger Module for Arduino Diy Kit|Integrated Circuits| - AliExpress
Power an Arduino with some 18650 batteries - General Electronics - Arduino Forum
What charging module to choose from? Diode needed with solar charging? - General Electronics - Arduino Forum