How to replace battery health
I’m wondering how to replace battery health for iPhone and how much would it cost. Also why is my battery health going down so fast
iPhone 11, iOS 15
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How old is your iPhone 11?
Battery Health normally declines an average of about 1% a month. But.....that's an average, not a rule. You might go 2-3 months with very little decline, then see a drop of 2-3% the next month. That's normal.
The battery needs to be replaced when Battery Health / Capacity is down to 80%.
Expect to pay about $70 plus tax, etc for a replacement battery at the Apple Store or an authorized Apple Service shop.