Thanks for taking the time to produce the Ebike Tech vids.

Hope the 'Weekly EV Tech' talks has a long-term place on this channel. Since it's a joy to hear your thoughts on the future direction of EV transportation. But 'battery swapping' especially for EV scooters, seems to be a far more viable near-term option than supercapacitors or hydrogen fuel cell vehicles. While battery swapping for full sized electric vehicles is still controversial. But battery swapping for EV scooters in countries like Taiwan where scooters are common, they have become ubiquitous. With EV scooters with fixed unswappable batteries are now in the minority, in those markets. And with swappable battery packs, also being utilized by micro EV. One battery swappable EV, being developed in North America is the Nimbus One. (There were some false reports that they went out of business, but as of a few months ago they stated they should be in production later this year.). It's a tilting enclosed three-wheeler and therefore at least in the United States can be registered as a motorcycle. Its swapping capability is mostly for individuals to be able to charge the batteries in their home. Especially individuals living in apartments that don't have a garage for charging. (FWIW I do have some of my own thoughts on supercapacitors but since they are more of a long-term future option and my comment was already very long. I'm saving my conjectures about how they can be best utilized for a later episode) Love to hear your take on battery swapping in general and/or any specific battery swapping EV, in a future episode. Looking forward to the next episode already, hope you have a good year.

Really enjoying your weekly e-bike tech updates. Also find your e-bike motor reviews very helpful. In Australia where I live converting acoustic bikes is just starting to gain some interest because of the cost of good quality new mid drive ebikes. As well as you can use one battery on multiple builds (i.e our extended family have 15 ebikes that we can all share batteries for longer rides, and i have different bikes for different purposes using the same battery). Would really like you to have a segment on converting dual suspension acoustic bikes, in particular mounting the batteries on the frames. And which "modern" dual suspension bikes are the best for it (e g. 2018 onwards). Thanks

First - I continue to *love* this series. Thank you for it 💯 I think the biggest current drawback to EVs in general (and a HOST of other technology industries) is energy density. But thats only half the story. EV (inparticular) batteries also need a good ability to **discharge** at a high rate without damaging itself. You can have batteries with orders or magnitude higher *energy density* right now - but if you can only discharge at ~0.1C, that isn't very functional. 'Next Gen' batteries also must have high energy discharge capability. Just about every other tech sector industry is just waiting with baited breath for 'next gen' battery technology.

If the Dutch can market a bike with a super capacitor, I'd be willing to bet Montreal commuters could make it work. Also, sodium is a lot easier to source than lithium and easier to recycle too - assuming the rest of the battery is equivalent - so I'm excited to see the sodium battery technology to come along.

As a person who rides a few different style of e bikes from 4000W bafang bbshd down to a 250W mid drive "dutch style bike" I have to say where there is infrastructure and safe places to ride an e bike(well as safe as can be expected) don't knock the humble 250w basic e bike. I will admit this only works for me using a mid drive setup as the torque curves are adjustable via the gears. My 250W e bike has only 550Wh at 36V but I can comfortably do 70 kilometers on a full charge however I have never tested this as I haven't ridden that far on a charge before recharging it! All this is based on a pedal only activated e bike so no throttle! I cannot say how these super capacitors are able to deliver the power but if the figures are correct for watt hours and there is no throttle I have no doubt 80 Kilometers is very achievable by the average middle aged person with a few extra pounds around their waist! Now if I only could get a 52/72V 25A charger for my e bike I would see a fast charge or an explosion! Sodium technology has one great bonus in my opinion. I know nothing about sodium batteries but as a storage solution for houses and maybe the national grid any battery which takes a bit more room for the greater safety margin has got to be a winner!

I had a "big" capacitor, about the size of a half pint glass. Used to demonstrate its ability to store energy by changing at 24V and then shorting it. Lovely fat blue spark and loud crack. Maybe best not to try that with this super capacitor...😂. Sounds like great strides forward - hope it's as good as claimed.

brief pedantry moment: people seem to have decided in common parlance we call watthours per kilogram "energy density" but the proper term for this is specific energy.

Very cool tech on the horizon. You fill me with hope with these updates. If more electric cars come out with competitive prices to the Yiwei I could see myself with an EV car. I live in NYC & my complex has a cheap public charger so a little vehicle like this would be fine for most daily (local) use. I have always been enthusiastic about new EV tech but I just couldn't make the numbers work between car prices & public chargers (so I stuck to DIY PHEV e-bikes). Having done the math on electricity vs gas an EV car will likely cost more over the life of the car but may break even if you keep it running long enough and a PHEV car is virtually pointless if you don't charge solely at home (even then you get about one gallons worth of range for about the cost of a gallon of gas). I hoped that would change & now it looks like the math may work out in my favor in the not too distant future.

Get the sodium-powered car and mount the capacitor bike on the back and you'll have it!

Thanks for your take on new e-teck, But can yon please turn down the background music for us hard of hearing. I like the music just not the volume. Thanks

Interesting video. Thanks for sharing 😀 The person practicing trumpet in the background wasn’t ideal, but these things can’t be helped I suppose. 😉

Super capacitors are obsolete. Super capacitors : 75Wh/kg and ~2000 cycles LFP : 150 Wh/kg and ~3000 cycles NMC : 280 Wh/kg and ~1000 cycles LFP is much better and also very safe!

Visited their website to search specsheet etc. about their products. Couldn't find any, guess its too early and still in development or testing. Worst scenario its just another unicorn yet to exist.

do the ultra caps work in the -c temp range like in alaska or iceland ? compared to li-on ?

The whole idea of this bike is extremly dumb. The only advantage of the capacitors is the high charge and discharge rates and they pair it with a 250 W motor. A normal E-bike battery of this size can easily provide 2.5 kW of discharge and 500 W of charge rate. Regen breaking is not used on most bikes because there is not much there to recover, because of the light weight and slow speeds. Most of the energy is lost to wind resistance anyway, so only on very steep hills would you ever need regen, and they designed it for the Netherlands.