I saw. Most entry-level ebikes have at least 10ah * 36v batteries; a few lightweight models have 7ah. So this has about half the battery capacity of the cheapest ebikes.
replyGiven the size of it and the significantly less weight it adds to the bicycle, I'd say half capacity is pretty fantastic.
reply(Of course, "capacity" is misleading, as this will be less efficient than a real e-bike.)