I watched the video this morning. Rather interesting. Seems that they have a charger that will also work off of 12V... so it could be charged on a boat using boat engine driven alternator without an inverter (although no doubt, that charger is an inverter)

It appears as though the battery handle is an opening through which you could place a cable lock, and it appears that the tiller handle can't be removed unless the battery is removed first.

Would that work?

Is there any key? Other than the "deadman?"