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I have had another look at the seller link and the controllers and managed to expand the fuzzy pics the controllers are sensor less square wave models so my mistake for not noticing this when supplying the link, the actual vendor doesn't mention this at all. The motor connector you can't...

You could use a Hailong battery with integrated controller if the combo will attach to the bike though they will be heavier and larger, add a lcd with five assist levels for better power control. The main issue is the motor connector and if it is a standard ebike hub one used or not, other wise...

No throttles or twist and go allowed of course.

You can use lithium or lifepo4 as long as the voltage is similar, the controllers should be ok (but check out there current output) so new batteries are capable, make sure you get new chargers with any battery. How about some pics of the bikes and controller wiring for us to see ? If brushed...

If the batteries are wired in parallel then theoretically yes, if they discharge equally.

They see me on my ebike at the railway station and sometimes, they must think WTF as I trundle by with a trailer in tow with my component bee hive stuff on the back and other kit. Later on in summer I can be towing about 100lbs of sealed honey for extraction and I daren't go to fast as you can...

The gap may also rely on the magnet field strength.

You need to open the controller to check the capacitor max voltage. The cctv batteries are probably not suitable they are likely low power/current drain but high capacity cells, the opposite for ebike use. Find a suitable battery then yes in series it will boost the voltage.

I have various 18650 cells which I use for Torch's, wildlife camera's and other uses but have never bothered checking how much capacity might be left in them. I have many cells sitting at various SOC an decided I would see what possible mah they might have left. I haven't got discharge tester...

No you need the road link as the derailleur only has a max tooth allowance all the road link does is convert the med cage to a long cage in effect. You may have to add one or two links and wind the B Screw win as far as it will go, I had to buy a longer B screw for mine to work better. My...

I don't think you have to worry about ebike over the 15.5mph limit as the accuracy may be out , a leeway of 10% + 2mph is often used by law enforcement/mobile speed cameras though isn't universal across the country.

David Miall the Wisper MD/Boss often pops up on the forum so that speaks volumes that he is here if someone needs him, also Woosh though mail order are excellent with their service on here and on the phone. The Wisper Wayfarer is around the corner so to speak and is imminent I believe to the...

Those cheap control systems are rubbish, with only one PAS level is has no choice but to give max current and speed. The system is in control of you rather then the other way around. The KT will give max speed in each PAS level but only if pedal for it with the cadence, the beauty of them is...

Sinewave is for hall sensored motors which you have, the six small wires in the White (dj7061) connector block 2nd picture. You may have to change some other connectors if they don't marry up. You haven't told us your battery specs or a link to it.

It's like anything if the ones before have been reliable and work for you well then there is often no need for change.

P1 is sensitive on my bike, the cut off speed certainly is noticeable with changes. I use current control and the speed limiting, I only use 25km/h limit as a base setting. the odo readout is set to mph so I adjust P1 to read 15.5pmh and then see what a gps reads. I adjust P1 there after to fine...

If you want to use a larger low geared cassette use a road link then you keep the same derailleur, SJS use to do a copy of the Wolf link but at a fraction of the price. https://www.sjscycles.co.uk/gear-spares/aluminum-rear-derailleur-hanger-extender/

Each to their own, front or rear hubs work amazingly well and are pretty bullet proof for reliability. Tubed punctures are an issue if you go down the correct route, whether using a more puncture resistant tyre or using an easy to replace tube that doesn't require a wheel to be removed.

Show us the battery on the bike or is it in the frame ?

It looks like you have a speed controller they can be horrible with little control, giving an uncomfortable jerky ride if not scary feeling. Does it have a display ? Which cheap kit is it ? The PAS control on the KT are very good with 5 varying noticeable current levels the first four are...