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If you have a throttle fitted then a brake cut out is a good idea , other wise they aren't really necessary unless the PAS has a bit of over ride.

He doesn't know what he's talking about, brakes sensors/cut outs are there to protect the controller from frying. They have no effect on the motor. Only one sensor /cut out is needed so fit it to the rear brake.

At least with the Yamaha battery charge socket a repair is possible and workable and at least two examples of a repair.

The most common problem is compatibility, lcd displays and controllers are programmed to work with each other for compatibility. Trying to match different brands will usually not work very well if at all.

For UK owners there are options possibly with a similar looking connectors. IP68 Waterproof Connector Aviation Plug 2 3 4 Pin 20mm Panel Cable Screw Fit UK | eBay WP20 4Pin Waterproof Chassis Panel Mount Aviation Plug Cable Connector Com | eBay

The motor is for cassette, the Chinese get the explanation wrong. They confuse things by calling a freehub a freewheel hub and a cassette a freewheel cassette.

Probably why I have never seen one, not having a freewheel hub.

Just realised it is you on the other thread about the brake calliper hitting the hub casing, does that lock nut if screwed on allow the calliper to clear the hub ?

No, I can't see a reason why it's there. I haven't any on my hubs. It might be handy if you need a spacer inboard.

Yes , it will be a no name China branded one.

Often one has to upgrade the brake rotor to a larger diameter and fit the appropriate brake mount for rotor. One can try and space out the drop out width but the former is easier and saves pulling and puffing if you need to have the wheel out.

It is a thin threaded lock nut, can't say I have come across one for a hub kit.

Cassettes are made to suit the chains they use so 7/8sp , 9sp & 10sp all use a different size chain. Each cassette will have different spacings and cog thickness to suit the chain. They all fit on a universal freehub and rely on the stack height being much the same.

The only decent cell that is available which some suppliers/warehouses are able to order are Molicel 18650 P26A & 21700 P42A. Those rack batteries all slide out leaving a lump on the front end or I should say a compartment with a dc docking point for the battery to connect to, this connection...

There is no standard length one can buy 114, 116 & 118 links. New 6-9 Speed Bike Chain Shimano Sram Compatible 114 Links Bicycle Cycle Chain | eBay SRAM PC951 9spd Chain Grey (114 Links) | Planet X SRAM PC850 7/8 Speed Chain (114 Links) | Planet X

If you have to go down the thinner PAS disc route then any 3 wire one will be fine as long as the wire sequence is the same, if the connector is a Yellow Julet then wire sequence is standard.

This battery isn't far off being the same style , check dimensions carefully and it may be a direct replacement the usual caveat is to double check polarity is correct. 99.9 % sure the battery is end of life at 9 years old and get the pedal sensor repaired. 36V 13Ah Li-ion Electric E-Bike...

Example: 24V/36V E-Bike Battery E-Bicyclewith USB Port & Bracket Li-ion Pack Lockable | eBay

Brush Less Direct Current.

You could retro fit any battery that will slide in the rack, the controller in the front would need to be placed in the new compartment of said new battery. The on thing to do otherwise is make sure the controller and battery polarity are in the correct order. If need be buy one with a rack a...