Do you think it is possible? Sparta seems me quite an high-end product, a different category in comparison to this Currie... As far as I know, Ion technology has been licensed to other brands, such as Hercules in Germany (which sells bikes almost identical to the original Sparta) and Koga for a luxury version... But it is true that this kind of inner battery is widespreading: beside this Izip, see the new hungarian geo gepida, with a tiny motor without power specification as well... may be Sparta, which I think uses a different motor, is just selling around its battery technology?Maybe the company producing this is also the one actually manufacturing the Sparta Ion for Sparta, so explaining the identical battery elements?
I think that belongs with the fairies and dragons Leonardo!Maybe the misterious "protanium hub motor" of the new Schwinn bikes?