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iOS 13.3.1 Battery Test & More - iOS 13.3.1 Follow-Up - YouTube
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iOS 13.3.1 - Follow Up - Battery, Performance and more - YouTube
iOS 13.3 improves battery life and performance on older iPhones
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iOS 13.1.1 & iPadOS 13.1.1 Updates Released, Fixes Battery Drain Problems & More | OSXDaily
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