Oh my, I had no idea. I think it's simply terrible that Apple is forcing those unlucky people to keep faulty units. /s
Seriously, Apple has the best tech support and replacement program of anyone. Why not call them?
I did call them. Their solution was to mail it to them, and wait 6 weeks for a replacement. Or I could phone the store myself every day and check to see if they had any new stock in to exchange it, as they couldn't take my details and let me know when an exchange set was available.
My first support chat with the 1st set went to a Senior Advisor, they booked me a Genius Bar appointment. Even though I was talking with the US people from the UK. Exceptionally helpful. But I was passing an Apple store, and since only a few days old. I popped in to see if they had any replacements in stock that I could just switch out rather than waiting another week. They did not, but forwarded me to AppleCare. AppleCare wanted me to mail them their device, and wait 6 weeks with no device, and no money. So I said I'd rather keep hold of them (as they work beyond needing daily charging) until an exchange set was available, or just refund for cash and I'll order more. So I went back to the store. Asked if they are able to take my details and set any aside and I will exchange my faulty set when they come in. They said no, I'd have to call the store everyday, and ask about stock. Then when they had some, to get in ASAP and swap them before a customer purchased them. No solution they offered was convenient. So I had them refunded.
I have spoken to Customer Services regarding this, and they were very apologetic. Annoyingly, the store I was at DID have DoA stock, but were not available to retail staff. All they had to do was ask one of the Genius Bar staff who could have sorted this.
I bought a second set the day after, from the same store using fruit surge to find them, but again these are faulty. I have another Genius Bar appointment on Saturday, as this seems to be a better solution. If they have DoA stock then, hopefully my 3rd set will be fine. If they don't have DoA stock, hopefully they can get a replacement set, and let me know when they have them. Similar to what they're doing with my OH's iPhone 6s battery. That way I can at least keep, and get some use out of the product I've paid for. As having no device for 6 weeks, and no cash isn't an acceptable resolution.
If you read through my posts, I've not criticised Apple (beyond the above comments with regards to trying to swap them previously), it's a new product. It's one that makes big claims, and one that is quite an achievement. Of course with the first batches, there's likely to be bugs. And I understand as an early-adopter this is a risk you take.
In the mean time, there's nothing wrong with gathering data and information to give to Apple when I go and see them. Rather than "here you go mister, they broked". And in the mean time, there may be a common issue that can be resolved by the user. And then there's no need to go back to Apple. And those with issues also searching the net may find it useful.