Hello Navidghz,
Welcome to Apple Support Communities!
If we understand your post correctly, you want to know how you can take care of your iPhone battery because the battery health is at 88%. We'd like to help!
Below is an article that will provide information about the iPhone battery.
iPhone Battery and Performance
Here is an article that will provide you with suggestions to maximize the battery life of your iPhone.
Maximizing Battery Life and Lifespan
We also want to provide you with an article that will be helpful about the battery usage on your phone.
About the battery usage on your iPhone, iPad, and iPod touch
Here is an article about the iOS performance on your iPhone: About iOS performance on your iPhone, iPad, or iPod touch
We also want share an article about Low Power Mode: Use Low Power Mode to save battery life on your iPhone
Let us know if you have any questions.
Thank you for using Apple Support Communities.
Take care!