A significant number of iPhone users are reporting an issue with battery drain after upgrading to the iOS 14.2 update.

Threads on the Apple Developer Forums, Apple Support forums and Reddit, are laden with users raising complaints of increased charging times and shorter run time.

According to some of those posters, their handsets are running hotter than before – especially when charging, while many have noticed battery degradation according to the Battery Health meter within the iOS settings (via Mashable).
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