Neat deal up to a point, 8 kg weight OTOH about the same as carrying a spare battery. Heh, well-heeled E-bike tourists could probably arrange to make a couple stops per day at a FedEx office & pick up a freshly-charged battery mailed from home. Then you get all the range necessary. A bit expensive but OTOH folks pay big $$ for supported commercial tours on regular bikes. Perhaps E-bikes might move to more standardized batteries as with phones/tablets now having more standardized AC chargers.