Battery health

This behavior is expected. All rechargeable batteries are consumable components that become less effective as they chemically age. As lithium-ion batteries chemically age, the amount of charge they can hold diminishes, resulting in shorter amounts of time before a device needs to be recharged. The Battery Health screen you're referring to includes information on maximum battery capacity and peak performance capability.

Maximum battery capacity measures the device battery capacity relative to when it was new. A battery will have lower capacity as the battery chemically ages which may result in fewer hours of usage between charges. Depending upon the length of time between when the iPhone was made and when it is activated, your battery capacity may show as slightly less than 100%.

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. Learn more about charge cycles, or read a more in-depth guide into iPhone Battery and Performance - Apple Support. Hope this helps!

amila187 Said:

"Battery health: My battery health 96% in four months why ? I get my phone April 2 but battery draining 100 to 96% in July to august"

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About iPhone Battery Health Drop:

All is fine. Unfortunately, there is no way to determine when nor why the Battery Health decreased. Apple recommends you get a new battery, when the Battery Health reaches 80% or lower. So, you are set for now.