Need more power? An Apple Store or Authorized Service Provider near you can replace your iPhone battery. See the associated cost by coverage type.
Here's how to check if your iPhone needs a new battery
iPhone Screen or Battery repairs
Apple shipped me a 79-pound iPhone repair kit to fix a 1.1-ounce battery - The Verge
About recalibration of battery health reporting in iOS 14.5 - Apple Support
iPhone 12 Pro Battery Replacement with Genuine Apple Service Part
iPhone Battery and Performance - Apple Support
iPhone Battery and Performance - Apple Support
Here's how much Apple charges for iPhone battery replacements
How much does it cost to replace an iPhone battery? - Android Authority
How To Get Apple To Replace Your iPhone: Your Rights Explained