how to recalibrate the batter
my battery health is so very low now 89% how to improve this . how to recalibrate the battery
iPhone 11 Pro Max, iOS 14
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All rechargeable batteries are consumable components that become less effective as they chemically age. 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. For more info, see:
iPhone Battery and Performance - Apple Support
About the battery usage on your iPhone, iPad, and iPod touch - Apple Support