Greetings, Bharatshivajimore!
We see you've got some concerns about your battery life, and we'll be happy to review that with you.
Maximum battery capacity measures the device battery capacity relative to when it was new. A battery will have lower capacity as the battery chemically ages which may result in fewer hours of usage between charges. Your battery appears to be operating normally based on the screenshot you provided. You can read more about the battery health, and battery performance, here: iPhone Battery and Performance
Let us know if you have further questions.
All the best.