How can i charge 2 3.7v li-ion batteries using 1 power source. - General Electronics - Arduino Forum
Benzo Energy / How much voltage should be used to charge a 3.7V lithium battery? - Benzo Energy / China best polymer Lithium-ion battery manufacturer,lithium ion battery,lipo battery pack,LiFePO4 battery pack, 18650
power supply - Step up converter (3.7V to 5V) that will also charge battery! - Electrical Engineering Stack Exchange
Make a 3.7 V Li – ion Battery Charger using TP-4056 (Part 9/9)