Battery warranty
Terms and conditions for replacement of battery if the battery is under warranty
iPhone 12 mini, iOS 14
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Here is an article that may help.
- iPhone Battery and Performance - Apple Support
- "A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge. Learn more about charge cycles."