How to test 18650 batteries

Here are links for the primary parts used in this video:
► 18650 battery capacity tester: https://amzn.to/404m8Nh (Amazon)
► 18650 battery charger: https://amzn.to/3PZzl5A (Amazon)

Background Music song#1 :
► Track: JPB - High [NCS Release]
► Music provided by: @NoCopyrightSounds
► Watch: https://www.youtube.com/watch?v=Tv6WImqSuxA

Background Music song#2 :
► Track: K-391 - Summertime (Sunshine) [NSC Release]
► Music provided by: @NSC
► Watch: https://www.youtube.com/watch?v=NWc1VaRMqLM