To summarize, here's my understanding of the overall battery policy, in the US:
For iPhone:
- You can insist on getting your battery replaced, even if battery health is still above 80%
- However, you do have to pay the battery replacement fee (eg. even if you have AppleCare, you still have to pay the fee)
- It's possible some Apple sales/genius folks will try to give people a hard time (or dissuade us from doing so), or if you act overly entitled/make Apple employee not want to help you. But in general, you should be able to do this, either without issue, or if you insist/escalate to a manager
For Apple Watch and iPad:
- For these devices, they replace the whole device (with basically a certified refurb) rather than actually replace the battery...
- You must be <80% in their battery health diagnostics.
- You cannot say you'll just pay the battery replacement fee, as that fee is much lower than the cost of a refurb device. - Sometimes I wish it were different, as it's Apple's choice to make the iPad in a way where it's cheaper to just give a customer a new device rather than try to disassemble and replace the battery... But I get that probably too many people took advantage of this, so, they changed/enforced this policy at some point!