Battery health
I have purchased iPhone 14 last month then it was 100% but now 99% why this is so soon.
iPhone 14, iOS 16
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Battery Health & Performance
Your battery health is fine and is undergoing normal usage. iPhone batteries, like all rechargeable batteries, are consumable components that become less effective as they age. 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.