I understand that my iPhone is facing software problem

You are welcome.

Yes, you can make an appointment online:--> Genius Bar Reservation and Apple Support Options - Apple

or, you can contact an Apple Store (they are reopening after the lockdown) among this list:--> Apple – Location Selector

Just to give you an idea, these are the prices valid in US Apple Stores (tax excluded, work included):--> iPhone Battery Replacement - Official Apple Support

If you're out of USA, check those prices in your country.

Regards

Giulio

We'll try to help you if you tell us what your problems are.

Please describe your issues and or your needs.

Regards

Giulio

Ah... okay.

What is your battery maximum capacity percentage?

Go to Settings>Battery>Battery Health... and tap there.

The only option is to have your battery replaced.

Create a full backup of your iPhone's content, before your battery dies completely.

Regards

Giulio

You are welcome :)

Best of luck

Giulio