there you have your answer. those chargers are overkill and shouldn't be used regularly. i've been using a 5w apple charger (the one that came with the iphone 11) and my battery health went down by only 3% in the past 6 months, while just one year of 20w charging drained it from 95 or so to 80 in a year. i've been using a 5w again since last summer and it only went down 3% since august, so i'd say about 1% every 2 months whereas fast charging messed my shit up with 1% per month. it's worth a try in your case as well.