iOS 11.3 Beta 2 Includes ‘Battery Health’ Feature<img style="float: left; margin-right: 10px"  src="

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At the tail-end of 2017, Apple confirmed that it introduced a feature in iOS 10.2.1 earlier in the year that throttled iOS in an effort to stop random shutdowns in older iPhones with aging batteries.   
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iOS 11.3 Beta 2 Includes ‘Battery Health’ Feature