iOS 12.3.1 Improves Battery Life of Older iPhones

Late last week, Apple released the bug-fixing iOS 12.3.1 update. It was primarily aimed at fixing some VoLTE and Messages related bugs that made their way into the OS with the iOS 12.3 update. However, it looks like iOS 12.3.1 also brings about a small improvement in battery life on older iPhones.
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