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After updating my iPhone XR to IOS 18.1 my battery health has reduced from 91% to 4% overnight.Interestingly the battery is draining at a normal rate as when the battery health was 91%Could this be a system glitch?
Yes, this has been noted on several versions. Have you updated to iOS 18.1.1 that was released just 3 days ago? It contains bug fixes and security updates. This may resolve the inaccurate measurement of battery health.
Battery health has decreased drastically after updating to IOS 18.1
