Battery

Battery Settings are used to see what the Maximum Capacity of the battery is at the current time and estimate the amount of time left on the battery.

But......I do not understand what you mean by "turn on my healthy battery in settings". Battery Health is always on. You cannot turn it off.

Not sure why you would want to do this, but you can turn off other options like Optimized Battery Charging and Clean Energy Charging, but these settings are designed to prolong the life of your battery. If you don't want to do that, you can turn off these settings.

Batteries - Maximizing Performance - Apple

I do not understand your question. The battery on your iPhone is not something you have to turn on. Please try to explain what you are trying to do. And why.