Why my battery health day to day decreased?
Why my battery health day to day decreased
iPhone 11 Pro Max, iOS 13
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How long have your owned your iPhone and what is the battery health percentage on your iPhone at present?
Battery Health & Performance
Your battery health is probably fine and may be undergoing normal usage. Charge it whenever you want to. Try and not let your battery charge get below 20%. Your iPhone cannot be overcharged because it has a safety circuit built into it. You should change out the battery once your Battery Health reaches below 80% which will take over 2+ years to reach under normal usage. Until then enjoy your iPhone.
Here is some more reading on an iPhone battery and its performance ➔ iPhone Battery and Performance - Apple Support
Axel F.