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.
And there are devices which have a non removable but still no waterproofing.
If the reason for non removable batteries was to make phones waterproof…