https://wccftech.com/users-report-severe-battery-drain-issues-on-older-iphones-after-ios-14-2-update/

Apple controls its hardware through software upgrades and while it is intended for good, sometimes it creates issues for users. Seemingly, many iPhone users are reporting battery drain issues after updating to iOS 14.2. If you are a victim of the problem as well, know that you are not alone.

As mentioned earlier, some iPhone users are reporting on Apple developer forums regarding faster battery drainage and longer charging times after updating to iOS 14.2. Furthermore, users are also reporting that their iPhones are losing over 50 percent of the battery in less than 30 minutes. In addition, a large portion of the battery life is being dropped in just a few minutes of use.