I am having also having a problem with excess battery drainage, 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 found that 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. Even after stopping Cellular Data, I have noticed unusually rapid battery depletion if Wi-Fi is turned on. So check your Push Notifications, and see if that might be the problem. If it is, perhaps you will have better luck with Apple Support.