Yeah, I want to haul around a battery.

I've actually thought about this. Until charging lots in parking lots become common this makes sense. If you have ever driven an old diesel in cold weather you know how true this is, finding a place to plug in the engine to keep it warm is next to impossible.
@ Jamie Lill: Yeah, it is a pain, but when electric cars are common finding a place to charge will be easy. As it is right now it is next to impossible so something like this makes sense for the short term.

Whaa--Jamie. Then DON'T-- they are offering it as an 'option'.

Now we are talking!
This makes a TON of sense for anyone that is living in an apartment and does not have the ability to charge from home. My wife and I were seriously considering a Leaf, but due to the fact that we have no means of charging it from home, we went for a conventional Prius instead.
If a battery pack was removable and had wheels... I could see the ability of wheeling it around to bring it inside to charge. (so long as you don't need to carry it up a flight of stairs). And at only 30 lbs, I question why they don't offer a larger 60 lb version. W/ wheels and a handle, 60 lbs would be easily manageable.

They are trying to recover cost of development. The vehicle battery cost is too high.
Regarding the detachable option, 12kg is not that heavy. Make them into a briefcase form factor.

That max speed seems designed to fit within the EU definition of a moped.

This car would work somewhere like Italy where they are used to mixing fast and slow traffic on the same road (such as the Piaggio Ape 50cc three-wheeled pickup and van) but I think it would be dangerously slow for other markets. I can't see this car working well in London or New York, which may have slow average traffic speed overall, but peaks of much faster movement, as well as drivers who don't give a damn about anyone else's safety.

The thing is a joke. Just drive the thing into the house and to the outlet.

Given the speed and range of the toy just give it pneumatic power that will also provide cooling in the summer. The Energy storage device will have a longer life as well.
Also make the home air compressor generate the domestic hot water as well.

This is good for apartment dwellers who don't have access to outdoor electrical outlets. And that dolly could hold another battery for a larger, faster EV.