Today Apple is releasing iOS 11.3, watchOS 4.3, and tvOS 11.3 to everyone with a compatible device. iOS 11.3 iOS has gone through a few beta builds recently, and now version 11.3 is finally ready for primetime. It includes the self-explanatory Battery Health tool that the company promised following the iPhone throttling scandal. This tells you whether your device has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. When that happens it will apply "performance management" (don't call it throttling) to prevent such things...
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