Battery health is very fast to low
Why my battery health is so very past to low battery health?
iPhone 11
Battery Health / Maximum Capacity will decline on average at about 1% a month. So, if your phone is 12 months old, the Health might be about 88-90%
If your phone is 2 years or 24 months old, the Health might be down in the 80-83% range.
It's time to replace the battery when Health drops below 80%.