Reporting back from what I tried this weekend.
So I drained it completely, well until it stopped charging my phone. It was blinking 1 light and it stopped charging. Does this Anker battery have a low voltage shut off so it doesn't kill the battery? I would assume so if it was blinking 1 light and stopped charging. Anyhow, when I drained it all the way down and charged it full. The battery seems to behave better. When I first got it brand new last week, it had 3 lights on it. Now at 100% charge, it doesn't drain quickly as it did before. If I charge my Nintendo switch when it's at 20-30% to 100%, I notice I lose 1 LED light in the Anker battery gauge when charging it twice from 20-30% to 100%. Someone on here mention the battery on the Switch is large in size. Might be why it takes a lot out of the Anker battery.