Here's how to check battery status/health on your Samsung Galaxy device - SamMobile
How to Check Battery Health in Android? [Cost-Free Ways]
How accurate is the Samsung Members health check? I got the phone second-hand and it said the battery was "bad", so I had it replaced and rechecked it, it says "action required"
How to check the battery status of your Android smartphone | nextpit
S21 Ultra Battery health low - Samsung Community
Samsung Galaxy S21 battery life — the results are in | Tom's Guide