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On cheap bikes, the brakes are always a weak point. The gears always work OK, as does everything else.

Rather than spend money, you need to find out what's wrong. Step 2. Measure the voltage between the black battery wire and any of the thin red ones that go to the throttle, PAS or motor hall sensors. It should be around 5v. If you don't have 5v, take a photo of all the wires and connectors...

If the connectors don't match, cut them off and solder the wires together. As I said, your bike should work with them disconnected. If it's not working, you have to find the cause.

They're the brake connectors in your hand. The brakes are already disconnected. There's nothing else to disconnect. Where was the cable damaged?

You have to look at the controller to see if it has the spare three-pin connector for a throttle. I've never had a sample of your bikes, so I can't say for certain, but the controller is probably in the back part of the frame. You fold the bike, then you should see a panel with the battery...

The brake switch is in the lever somewhere. Without a photo, I can't say any more than that. An electric cable comes out from it and finds it's way to the motor controller. The cable can have two or three wires in it depending on the type of switch. Whichever type you have, if you were to cut...

The switch has to be open for the bike to work, so just disconnect it.

If you test halls with an independent power supply, they often don't switch properly because they need a pull-up resistor between the signal wires and 5v. I noticed that your motor cable was badly damaged where it comes out of the axle. Did you repair that?

Red to red, black to black and white to white,

You only need one brake switch, so if the other lever has an electrical cable coming out of it, you don't need to fix the broken one, though it will be a good idea to disconnect it when you get to the controller, unless both brakes are spliced onto the same connector. If you need to fix it, all...

Though it can be done if you're good at DIY, it's probably not a good idea. Why don't you fix your faulty old bike. If it has a good battery, there can't be anything wrong with it that's going to cost a lot.

I would solder the wires for the lights to the main power wires inside the battery receiver, in the box where the integrated controller would go. There's a fuse in there, so anywhere downstream of the fuse. You can stick the lights fuse in there too. A 1 amp fuse should be enough, but the only...

Another thing i forgot to mention. Using a bike with 20" wheels gives you 30% more torque from the same motor in a 26" wheel. You can take any typical 36v 260 rpm motor, put it in a 20" wheel and run it at 48v. You'd only need around 15 amps in that case. Another option is the Xiongda 2-speed...

I'm not talking about their actual abilities. I'm talking about the defeatist attitudes that some of them have. We even get the ones that come on asking about what kit they can fit, then when everything is sorted, they ask who can fit it

Thank you. Yes, I've seen listings where it's spelt incorrectly. Hailong isn't a battery type as such. Hailong only make the case, which they sell to battery makers. What's inside the case is different every time I open one. there are good battery makers and bad ones. Unfortunately, you can't...

That's what I was saying earlier about introducing new constraints, like " I don't know anything about electrical stuff", "I don't know how to solder", "I have no tools", etc. Basically, if they don't have the wherewithal to fit a kit, they shouldn't be messing about with them when you can buy...

That would be enough power for a semi-disabled person. 48v and 17 amps should be enough for a normal unfit person, which puts you in the power handling range of a normal 250w motor. The most important thing is the motor's maximum RPM, which should be no more than 230 RPM at 48v, assuming that...

Stop saying Hairon. There's no such thing. It's Hailong!

I buy nearly all my stuff outside the UK. Why would anyone have a problem with that?

I get fed up doing that because they always introduce silly constraints afterwards, especially when they haven't given enough info in the first place, and they rarely take any notice of what I suggest anyway. Unless someone is stuck or has very specific requirements, I try to avoid making...