Daewoo Tico is 680kg and I have seen few of these on the streets (not so common anymore).

Polski Fiat 126p ~600kg

If these are like most electric cars, the batteries are in a flat compartment at the bottom of the chassis in a box design, giving incredible torsional rigidity and a very low centre of mass, so great cornering. They could be pretty safe for the occupants, even fanging it down a narrow European street. However, not so safe for pedestrians. I'm guessing these won't come with ABS or mm wave collision detection emergency brakes; it's one of those items that is cheap to manufacture and install, but the IP and testing is expensive.