The new regulations apply towards any portable device, including handheld consoles, but based on the wording I highly doubt they'll have to change much of anything.
A portable battery should be considered to be removable by the end-user when it can be removed with the use of commercially available tools and without requiring the use of specialised tools, unless they are provided free of charge, or proprietary tools, thermal energy or solvents to disassemble it.
Commercially available tools are considered to be tools available on the market to all end-
users without the need for them to provide evidence of any proprietary rights and that can
be used with no restriction, except health and safety-related restrictions.
The Switch 2 disassembles the same as the Switch 1, requiring only phillips and triwing bits, both of which are not specialized tools, they're commercially available, so they don't need to make any massive design changes to fit the new regulations.
The only thing Nintendo would realistically need to change is the adhesive they use for the battery, as it's designed currently you need to use alcohol/heat (aka a solvent/thermal energy) to loosen the adhesive, but they could just implement a pull tab system on the battery like most modern smartphones use and that would be good enough to fit within the regulations without changing anything else.
A lot of people are definitely misunderstanding the new EU regulations, nowhere does it say it has to be "easily" removable (as most news outlets seem to claim), simply that it must be removable with readily available tools. This doesn't mean we're going back to devices with backs that just pop off with clips and the battery just falls out.
Technically, the current Dualsense controllers
already meet the new EU regulations, you only need the readily available phillips screwdriver and maybe a plastic spudger to remove clips. If the rumored V3 controller is actually "in development", Sony doesn't need to change anything about the way the battery is designed, and if they do it's not likely they're doing it to meet the new regulations.
