I would prefer batteries in machine, too; but this does have some sustainability and repairability (by not needing it) advantages.
Cost is about 10x that of their non-rechargeable brethren, but obviously there's return on that investment.
I doubt this would be a dealbreaker for most people, but it's a choice that will provide a consistent small annoyance for users.
I would hazard a guess that the battery in the controller will have a life measured in weeks if not months.
I think you're mixing up the controller and headset batteries. The controllers use AA batteries and should last for potentially months of use.
The headset itself uses a rechargeable 21.6 Wh Li-ion battery with 45W charging over USB-C.
I'm not trying to sell you on these in particular, it's just that I am struggling to find "non-German" results. Go search for them on ebay or a local store.
While a brand new device could employ something more apt? Even say something larger which can store more energy, dunno. It just feel off to still have AA batteries (which are generally not rechargeable) in a new product in 2025 which is not targeted to elderlies.
>AA batteries (which are generally not rechargeable)
I can't recall the last time I saw single use batteries in use, except maybe in a brand new remote control bundled with a TV, which was quickly swapped for rechargable. I don't even think of this most months, from where I'm siting I can see my battery chager and there's two sets of AA and a set of AAA sitting on there fully charged, ready to go. I think I paid $12 for the charger in 2008, very low barrier to entry.
Also I would recommend switching to the IKEA rechargeable batteries which are supposedly the same thing except cheaper.
Realistically though if the cover for the battery is nice to remove/insert then it wouldn't surprise me if having a battery charging station and hot pairs of batteries to swap out is actually the nicer usability option vs cording or dock downtime (if you leave them sitting on the couch with a low charge then need to charge halfway through).
Also if the stand is also a charger then the hot-swap is mostly a non-issue. Playing with this for more than X hours should not be the default usage.
I just buy rechargeable batteries and keep a charger nearby. When batteries die, they come out and straight into the charger. Always ready to go.