Lithium-Ion Batteries, Part 2: What You Need to Know Now | BoatTEST
Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Auto Cut off 3.7 volt Lithium-ion Battery Charger Circuit - Hackster.io
How to Build a 18650 Lithium Battery Charger and Booster Module