I love my AirPods but I am close to taking mine to the store again to be replaced for a second time. I wear them every day to listen to podcasts as I run for 30 minutes. The accumulated sweat has corroded the charging contacts in the case. I am currently working around this by charging them in my girlfriend's case.
Amusingly, the instructions for AirPods say to not get them wet. I don't know how one could exercise rigorously and not get sweat on them.