Raspberry Pi Low Voltage Warning
Resolving the Low Voltage warning (aka the "lightning bolt"
Please note that this research was done on Pi 3 and lower. I don't own a Pi 4 which uses another USB spesification and different power requirements.
Introduction
This is a document that was produced from a mess of personal notes in order to try to create a resource that might be useful for someone that runs into the same issues as me when it comes to powering a Pi in different scenarios.