My battery health is decreasing fast

Hi mhd242,

Thanks for posting in Apple Support Communities.

We understand that your battery health is decreasing. rechargeable batteries will decrease over time with daily usage. There are a few factors that will affect how long your battery lasts including how often you're charging and what type of charger is being used, the temperature in which iPhone is being used and of course the apps installed and tasks performed.

You can reduce the wear on your battery by enabling features like Optimized Battery charging that learns your charging habits. You can enable this in Settings > Battery > Battery Health & Charging.

About Optimized Battery Charging on your iPhone

iPhone Battery and Performance

Regards.