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Re:iPhone Performance Degrades as Battery Ages by oceanghost on Tuesday December 19, 2017 @06:19PM (#15965406)
You really can't though. I had a phone with an awful battery-- it would shut off around 25% randomly. I brought it into Apple 3 times, it even had apple care-- and because the f*ing diagnostic suite identified the battery as good, they wouldn't replace it.

They wouldn't even LET ME PAY FOR THE REPAIR.

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.

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.
Re:iPhone Performance Degrades as Battery Ages by suryamp on Tuesday December 19, 2017 @06:35PM (#15965543)
> LET ME PAY FOR THE REPAIR.

Then you would know that it is totally their fault and the liability would be on Apple to fix other people's devices.

Re:iPhone Performance Degrades as Battery Ages by schrodinger on Tuesday December 19, 2017 @07:16PM (#15965828)
Same here. I went to a 3rd party place and they replaced it cheaper anyway, with no problems.