From the link ...
"Apple is reducing the price of an out-of-warranty iPhone battery replacement by $50 — from $79 to $29 — for anyone with an iPhone 6 or later whose battery needs to be replaced, starting in late January and available worldwide through December 2018. Details will be provided soon on apple.com."
The "details" will most likely be what i guessed, must fail the battery test before replacement.
Yes, I don't disagree with you. A lot of phones won't meet (or, rather, fail) that test. If that's the case, this will backfire BADLY. People will make Genius appointments, wait because the Genius is always 20-30 minutes late around here at least, and then be sent away empty handed. People will be ROYALLY pissed off.
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I went back and saw this. “for anyone with an iPhone 6 or later whose battery needs to be replaced, starting in late January and available worldwide through December 2018. ”
Says nothing about needing to be under 80% though that’s the same standard on the MacBooks.
Yes. As I just posted above, gif that's how it works, this could be a train wreck.