Sorry, but that's just plain b0ll0cks. People look at the reviews, and among many factors considered, comment specifically on the above average torque available from the 48v system. Many will be swayed by such an advantage.
The product page does now state 36 volt 12.5AH, but the charger spec is still listed as a 56 volt charger... and the Voyager spare battery is listed as a 48 volt battery HERE.
If there is to be a major change that is to affect performance to that degree, such a change would need to be emphasised to allow the buyer to make a reasoned judgement. The ASA would certainly have a problem here.
Well, i received a 36v battery and when asked if i can put the 48v battery in they said i can not as the new model can only support it but its utter bull as the controller in the bike is a 36v/48v controller.
The company is a joke and always leave it in the dark when new batteries are coming into stock.