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Re:iOS 12, reviewed by ben174 on Tuesday September 18, 2018 @06:20PM (#18019744)
My iPhone X is at 90%. You don't think it's worth the $29 + trip to Apple Store?
Re:iOS 12, reviewed by throwaway427 on Thursday September 20, 2018 @06:14PM (#18035864)
He tried to tell me that I didn't need to but I told him the battery drains precipitously in the cold and that'd I prefer we switch it and he just said ok and started the process.

[edit]

To answer your question, I guess it couldn't hurt? The thing is that I definitely did not trust the 81% that the battery health check was telling me. My battery would drain in minutes from 30% and the phone was practically useless in the cold.

Re:iOS 12, reviewed by achompas on Tuesday September 18, 2018 @06:35PM (#18019871)
If your battery health isn’t low enough, Apple will not replace the battery. This happened to my mom and her iPhone 6.
Re:iOS 12, reviewed by gnicholas on Tuesday September 18, 2018 @09:04PM (#18020814)
This was the rule early on, but I heard that they will now replace the battery no matter what. The current guidelines don’t mention any threshold: https://support.apple.com/iphone/repair/battery-power