Nintendo has officially disclosed that it's planning on releasing a new version of the Switch 2, updated to comply with European Union regulations. According to these new rules, certain devices, including portable handhelds, need to have easily user-replaceable batteries if they wish to be sold in the region. The law goes into effect from February 18, 2027, so we can assume Nintendo will have an updated Switch 2 out by then.
The company has a dedicated "Compliance with EU Directives and Regulations" page on its website that was just updated with a new "Batteries Regulation" section. It mentions how the EU's Waste Electrical and Electronic Equipment (WEEE) directive has made replaceable batteries mandatory and that "Nintendo is implementing measures to comply with these requirements by preparing versions of products to meet the Regulation."