Powerful Universal Power Bank DIY
This video shows how to assemble a powerful power supply using 4 industrial Li-ion 18650 batteries (3.6V) with adjustable output voltage. Electronics used in this project:
Discharge controller for lithium-ion batteries
http://ali.pub/19x56v
DC-DC step-down converter D067V 4V-38V to 1.25V-36V (5A max)
http://ali.pub/19x28p
Box for 4 18650 batteries
http://ali.pub/19ya0a
Sanyo NCR18650BF 18650 3400 mAh Battery
http://ali.pub/19y9b7
Calculations, details, electrical circuit diagram
https://yadi.sk/i/Jhq8CuN63Gn4J5