Astrolux VC04S charger: https://usa.banggood.com/Astrolux-VC0...

Compatible with 10440 14500 18350 18500 18650 21700 26650 AA AAA NiMH NiCd Li-ion LiFePO4 batteries and more.

Contents
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00:00 - Intro
01:09 - What's in the box?
03:17 - Best sub $20 charger
05:11 - Fits Button 21700 (mostly)
06:19 - Changing Amps
07:13 - Using USB-C and PD
07:40 - Discharge and Test
08:10 - No temp sensors
08:48 - Conclusion