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.
When I first met my wife, she was rocking a Samsung Galaxy S5. It was water resistant and had a removable battery.
Also, devices that are sealed units and claim to be “waterproof” but do not cover water damage under warranty should not be considered waterproof.
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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…