I kind of get it if the interest rate is 4.15% (assuming that that’s what APY means). Is this a common rate in the US? From my European perspective that’s incredibly high.

I did, and as you quoted, it includes all batteries. Then it gives a list of examples of things with batteries.

I’m all for it, but how is this going to work with tiny things like AirPods? Currently the whole thing is packed with tiny batteries glued onto the electronics so that it can fit in your ears. How do you ever make that replaceable without making them huge?