At what percentage should my battery health be when it’s time for me to do something about it? Do u guys replace the battery in store?

This is a user helping other users with tech questions

forum, you are not addressing apple here  just  fellow users

 have you read

About the battery and performance of iPhone 11 and later - Apple

Support

 and maybe

iPhone Battery and Performance - Apple Support

and Batteries - Maximizing Performance - Apple

people report apple does not change

the batteries until they are lower than 80% in health

you can try contacting apple Get Support (apple.com)

AT&T does not replace batteries. Apple replaces batteries in the store, frequently the same day. But see Michael Black’s post. Replace the battery if the phone is not performing the way it should, not because of a maximum capacity value. Performance issues that are battery related include things like the phone shutting down abruptly when using a high energy demand feature like the camera or a cellular phone call in a weak signal area, or battery charge level that jumps around.

And consider that there are somewhere around 6 billion smartphones in use around the world, and pretty close to 6 billion users are unhappy with the battery life of those devices.

I would not do anything about a battery replacement based on any arbitrary estimate of capacity. Ask yourself simple questions like does it still meet your daily usage? Are you being inconvenienced by it not holding charge long enough for you to get through your normal day?

As long as the device is still usable to you, what difference does it make what some arbitrary estimate of battery capacity the battery health meter indicates? Batteries last as long as they prove useful to you. When they are no longer useful to you, or have outright failed, you replace them.

Honestly, I never look at battery health. People seem fixated on it and I’ve never understood why. It’s just a number.

Apple writes that their batteries are designed to retain up to 80% of initial capacity after 500 discharge/charge cycles. That does not mean a battery necessarily needs to be replaced at 80% capacity.