Make a 18650 battery charger, Li-ion battery charge controller circuit - YouTube
Li-Ion Battery Charger Circuit
DIY Lithium-ion Battery Charger - Hackster.io
How to Make Automatic Lithium Battery Charger - TRONICSpro
Robomalls 5V Lithium Battery Charger Step Up Protection Board Boost Power Module Micro USB Li-Po Li-ion 18650 for Power Bank Diy : Amazon.in: Electronics
How to Make Battery Charger at Home : 6 Steps (with Pictures) - Instructables