Power Bank with 18650 Li-ion Battery
Using micro controllers in the field requires battery power. USB power banks are readily available, but these devices are not serviceable and cost substantially more than the components they are built from. This post will cover battery power using a 18650 Li-ion cell. It is based off of the work done here, https://circuitdigest.com/electronic-circuits/power-bank-circuit. This diagram shows how these components are connected. The post referenced above had one flaw that should be avoided, the on/off switch was placed on the negative…