Replacing Battery
What is the price for replacing an iPhone 12 battery?
iPhone 12, iOS 16
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Go to this web site for information about how to request battery service for your iPhone: iPhone Battery Repair & Replacement - Apple Support
Enter your model information in the "Get an estimate" box at the bottom.
Batteries - Maximizing Performance - Apple
"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."