I have an Ultra 2 watch and the battery lasts 2 days which I love. However Apple stops the charging at 80%.

My Question:
Is it worse for the battery if I want a full charge every other day? I'd prefer that over an 80% charge every day.

I use the sleep tracking so I charge in the the evening and put it on before bed.

https://support.apple.com/en-us/105106