Why is my phone not showing battery informations

Where did you get it repaired? If not at an Apple Store or authorized repair center, they probably used a non-genuine battery.

https://support.apple.com/en-us/HT210323

Where did you have the repair done? Was it at an Apple store or Apple authorized service center? If not, you did not get an official Apple battery.

Since you did not use an Apple store, you did not get an official Apple battery. Your phone will not provide any battery health information.