Battery health draining fastly
Phone health suddenly drop 4% in one week only. I don’t know the reason why it will happen.
iPhone 14, iOS 17
Batteries degrade over time with usage due to chemical aging, that's just how they work.
You can expect about a 1% drop per month with average use on an iPhone. This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.
Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.
iPhone Battery Replacement.
iPhone Battery Service - Apple Support
About Lithium Ion Batteries
iPhone battery and performance - Apple Support (IN)
Here are some tips on maximizing battery life.
Batteries - Maximizing Performance - Apple