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A comment on iPhone Performance Degrades as Battery Ages. Parent comment

Re:iPhone Performance Degrades as Battery Ages by riahi on Tuesday December 19, 2017 @09:28PM (#15966516)
Agreed. I've been in 3 times. Every time I want to just pay for the replacement; they won't even offer the battery replacement if the diagnostic utility says the phone is good.

My phone randomly shuts down or rapidly loses battery once it is below 40%. It's even worse when it's cold.

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Re:iPhone Performance Degrades as Battery Ages by kuceram on Wednesday December 20, 2017 @05:59AM (#15968619)
That's exactly what's happening to me as well. I think it shows a battery percentage based on (old) current voltage which dramatically decreases with low temperature, i.e. when you pull your phone from warm pocket in cold weather.
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