The voltages are not going to be high enough to cause things like arcing through air. Basic precaution is necessary.
The idea is not even that you yourself are going to replace it, its more for shops with equipment and skills to order individual cells, put together battery packs, and then just replace them in cars without worrying about compatibility.
The idea is not even that you yourself are going to replace it, its more for shops with equipment and skills to order individual cells, put together battery packs, and then just replace them in cars without worrying about compatibility.