3.7v Lithium Battery Charger Circuit | Very Easy using lm317 - YouTube
Make A 3.7v LI-ion Battery Charger Circuit - TechSaw
Great idea Single Circuit 3.7 V 1S and 2S Battery Charger Circuit /LM358 High Precision Auto Cut-Off - YouTube
how to make USB 3.7V Li-Ion Battery Charger Circuit | battery charging cut off circuit | USB 3.7V Li-Ion Battery Charger Circuit | In this article we study a simple computer USB
Electronic Circuits: Automatic Programmable 4.2V Battery Charge, Current up to 500mA using LTH7R IC with PCB