It had been in the works for a while, but now it has formally been adopted. From the article:
The regulation provides that by 2027 portable batteries incorporated into appliances should be removable and replaceable by the end-user, leaving sufficient time for operators to adapt the design of their products to this requirement.
I don’t think it’s requiring the battery to be hot swappable. Just requires that the user can remove the back with a screwdriver and not have to worry about a bunch of different proprietary screws or absolutely require a third party repair option.
Someone can correct me if I’m wrong but I don’t see any reason why you couldn’t make a flip that can have the battery removable with just using universal screws and no glue etc
The flip is possibly doable, but as someone with a Fold4 there simply isn’t room in the device to start incorporating screws in the half with a screen on both sides. Only way I can see it working is putting the whole battery on the side with a normal back, but there isn’t enough room for the same size of battery. It’d probably also throw off the balance in the hand when open.