I met the current owner (& the bike) of the original UK demonstrator model of the electric KTM (looks like a very compact 125 supermoto) this week at a local biker social.
Real world range is 30 miles. Weighs 100kg. Takes an hour to charge. Top speed limited to about 60 by the gearing. Difficult to insure at present (MCE covered him eventually). Battery guaranteed to be +90% effective after 700 charge cycles. Much faster acceleration than a learner legal 125, but able to ride on a CBT due to some questionable power measurement techniques that use average rather than peak output for electric vehicles apparently. Battery weighs about 35kg and is removable, so I suppose it follows you could already make a 135kg bike with a 60 mile range out of this one with a spare! The battery is about the size of a medium car battery (but not that shape) and sits where the petrol tank and/or top of the engine would be on a petrol bike - the electric motor is smaller than the bottom end casing on a 125, so there is a trade off in space terms from that.
He told me KTM have some that you can go and ride - might be worth looking into if your interest in them is piqued?
The tech is moving along as is the support for it - I recently bought a 5 year old petrol-electric hybrid Lexus. I looked at the cost of the replacement batteries before I took the plunge, and it was something eye-watering like £3000 from Lexus -but- the few owners with high mileage 8-10 year old models in the club who have had battery issues (a few, certainly not all) report that you can get a full recon from a specialist in Northampton for £800 - so the "but what about when the battery wears out?" question is fast becoming much the same as "what about when it needs a new turbo" for a lot of other modern powertrains. Obviously conventional hybrid batteries are a lot smaller than plug-in electric or plug in hybrid vehicle batteries by comparison, but I suspect it's only a matter of time before they are also similarly affordably supported
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