[QUOTE=Quoth;4333238]All gadget batteries in gadgets sold in EU to be user replaceable by 2027.
They used to be.
https://www.theregister.com/2023/06/...y_eu/?td=rt-3a
I liked the USB-C mandate. This battery replacement mandate is also pretty good but since the batteries are internal parts to the "gadget," it will impact on design, size and maybe usefulness.
When I was a young engineer it was quite a challenge to unsolder a large chip bonded on a circuit board with a wave soldering machine.
Sometimes manufacturers went to Zif or ZIP sockets but they were much more expensive.
I can see a battery assembly that is connected via socket in a gadget.
An example is the battery in a home phone handset.
There you have 2 AAA batteries soldered together and connected to the handset via a simple wired plug which is well within the scope of the average DIY owner.
If the battery is shaped or sized in an unusual way, then a supplier must be available for an ordinary user. I think that requiring every gadget to be powered by replaceable or rechargeable AAA or AA batteries is a "bridge too far."