Kind of weird using AA batteries, I'd imagine something else would be better suited for this?
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I would prefer batteries in machine, too; but this does have some sustainability and repairability (by not needing it) advantages.
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.