My battery health decreased to 90% out of no reason even where i charged my iphone very effectively and on time never went below 10% more than twice in the 10 months of the usage period
help this thing out apple support
this is really not acceptable by your side
and the update is the reason clearly ios 16 is the reason
iPhone 13, iOS 16
Batteries will always decrease in health. Even if you put it on a shelf and didn't use it at all, health will slowly decrease.
How quickly it will decrease depends on how much you use it and the care you take of it (e.g., by using optimization).
Read this support article about Phone battery and performance to read about the battery health feature and what is considered normal performance --> 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." A degraded battery may display the notice: "Your battery’s health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity." If it is not at or above 80% "normal", consider contacting Apple about a battery replacement. --> iPhone Battery Repair & Replacement - Apple Support
Batteries will always decrease in health. Even if you put it on a shelf and didn't use it at all, health will slowly decrease.
How quickly it will decrease depends on how much you use it and the care you take of it (e.g., by using optimization).
Read this support article about Phone battery and performance to read about the battery health feature and what is considered normal performance --> 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." A degraded battery may display the notice: "Your battery’s health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity." If it is not at or above 80% "normal", consider contacting Apple about a battery replacement. --> iPhone Battery Repair & Replacement - Apple Support
Battery Health is an inexact figure that varies with usage. the typical Apple Battery lasts for about 2 years and should be replaced when Battery Health reaches 80%. Check this link for possible help...
Battery health decreasing constantly even if I’m using it on normal usual usage
