In July, the Japanese company announced plans to release devices with replaceable batteries in accordance with European requirements. The changes will also affect the Switch 2: such versions of the console will be slightly heavier, and the battery capacity will be smaller.
According to Nintendo's official instructions, to replace the battery, you will have to unscrew the screws around the perimeter of the case, including near the Joy-Con 2 controller mounts. After opening, the electronic boards and other internal components will become accessible.
DIY repair carries the risk of damaging the console, so it's worth carefully studying the instructions before starting work.
Earlier, documents from the US Federal Communications Commission hinted that Nintendo might be preparing controllers with replaceable batteries for markets outside Europe as well.