Battery draining very fast and also draining when kept idle

Hi! Im a tech guy not affiliated with apple, and we are not apple support. We are just a community who helps the community

I would check your battery health to see if there is anything causing the battery to drain, and if all looks good, I would check your coverage to see if you can submit a warranty claim. The phone came out September 13th last year, so you should be good. I left a few articles for checking battery health, maximizing your battery life, checking your coverage, and finally

Battery Usage & Life

Check the iPhone battery health and usage - Apple Support

Batteries - Maximizing Performance - Apple

Warranty & Repair

Check Your Service and Support Coverage - Apple Support

Apple Repair and Repair Status Check - Official Apple Support

I am having a similar problem with excess battery drain on two iPhone 12 pro maxes, an iPad Pro, and an iPad Pro second generation. I am using AT&T in St. Louis, Missouri. Problem started after installing iOS 15.6.1 and updating my apps. I am getting as much as 3.5 GB per day of "Settings > Cellular> System Services> Push Notifications", and my (otherwise healthy) battery requires unusually frequent recharging. I turned off all app Notifications (except Phone and Messages), and all background app refresh. Also, at Apple Support's suggestion, in Privacy>Location Services>System Services, I turned off several location related System Services (such as Location Based Alerts). This has not worked to stop the Push Notification data hemorrhage. Phone calls to Apple Support on 8/21/22 and 8/22/22 also failed to solve the problem. So far, the only way to stop the Push Notifications is to turn off Cellular Data, which defeats the main purpose of having a smart phone. Even after stopping Cellular Data, I have noticed unusually rapid battery depletion if Wi-Fi is turned on. I would recommend that you check for Push Notifications. If you find that this is the cause, perhaps Apple Support can help you.