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Looks like your multimeter battery needs changing. They can read incorrect readings with a low battery. Whats the pink card stuff under the orange tape?

The small Xiongda motor is in my avatar. For PAS control it will have an LCD so will have to hide that with the controller too. For throttle only you can trip the LCD connection so can do without it.

I searched "dialectric paste" on ebay and got results for silicone grease. Is "dialectric paste" the same as plumbers silicone grease? I've got a small tub of that I use on the shower sliding door.

Here's the expert breakdown of that fake video.

www.speedict.com Here's one for all the techy battery builders. My new favorite ebike gadget, the Neptune15 Bluetooth connected, app controlled battery BMS. It can be used with cell counts from 10s to 15s using most battery chemistry. Once I figured out how to set it up and use with my lipo's I...

Do the controllers have 5v the mini fan's could be permanently connected to?

Oh you got 2 Reaktor's on the go, lucky you, I've got one of those. Incidentally what volts/rating are your power supplies at?I'm sure my psu was also when/if you eventually switch to welding cells are you going to continue balance charging as you are doing now or switch to using a BMS ?

BC168 two - a new version ? What are you using to get the time down to 35 mins?

If your a bit of a geek and want to charge and balance your battery cells up to 90% then you want a Neptune15 BMS, I think it's great and use it with my Lipo's at the moment and will work with 18650 cells too. https://www.speedict.com/

Oh, it's a cassette version. Is this available from anywhere yet? The Xiongda YTW-06 is pretty good though.

It might just be you need some oil on your chain. When they get rusty like yours is they get stiff and don't travel around the sprockets smoothly.

Oh sorry, missed the high power bit, I was thinking more of good customer service. There is also Em3ev in China for high power units.

Try Woosh, or Darren at Brightonebikes for good customer service.

Chain guides like these will help keep the chain in place but you might not need it with a lekkie ring. https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p4712.m570.l1313.TR12.TRC2.A0.H0.Xchain+guide.TRS0&_nkw=chain+guide&_sacat=0

The gear sensor works quite well. I tried without and could not get the hang of pulling the brake for a second on every gear change so I like the sensor, some people say they manage without it. A splitter cable like this one allows you to connect the gear sensor and the brake cutoff to the same...

If it's only 2.5a I'm sure you could just remove the fan. But something like this should do and is fanless. https://www.ebay.co.uk/itm/42V-2A-Power-Adapter-Charger-Two-wheel-Balanced-for-36V-Li-ion-Lithium-Battery/323280977859?epid=675316974&hash=item4b450c3fc3:g:4ykAAOSwVttbD1md If the battery...

I cycle in all temps and weathers with these. Padded Hi-vis work jacket from Sportsdirect, keeps you very warm and dry for only about £27, also from there some lined Gelert walking waterproof overtrousers for about £15 but I also like my Altura Nightvision jacket and overtrousers too, just cost...

Any screws left over with nowhere to put them when put back together?

That's good to know, I was looking at a Q128c for my next build but will probably try this motor instead.

The extra cost per cell is helped by only 30 x 4250mAh Sanyo 20700B cells to get a resonable 36v 12ah battery vs 40 decent 18650 cells. Or only 20 Sanyo cells for a lightweight 8.5ah battery. Next years project could soon be in planning.