So I know that providing a Pi with too little power can potentially cause physical damage to the circuitry (brownout). I don't 100% understand how or why this happens.
I know that it seems a lot of people are able to run the Pi on portable batteries, but I'm wondering what happens when the battery dies. Will it start to provide less and less power until it provides so little that the Pi gets damaged?
So this question also involves the behavior of a battery as it dies. As a portable battery is dying, what is happening to the current? Does the voltage start dropping or is it the amperage? Or both? My understanding is that a very low amperage is what can damage the Pi.
I just need a little explanation about how these different things are working and how to prevent issues, because I'm just worried about bricking my Pi.