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Motors don't have a voltage. You can run it at whatever you want. The voltage only affects the max speed. That bike is generic. I've seen a few on this forum over the years under different brands and slightly different versions. The thing in the bottom bracket is probably the motor controller...

What does the switch on the throttle do? I gave you a list of tests to do in post #12. What were the results?

Show us what you have.

Start a new thread. Tell us what you have and how the problem started. Please, no wall of text about your brother's dog that you have to walk because he had a recent heart attack, and the dog can only be taken out on Thursdays because the butcher closes on Wednesdays to clean his shop, which...

You only have to make sure that it's in as far as the line. Either it is or isn't. You can see that by looking at it. I don't know why you guys have to make something so simple difficult.

If you look at that seller's other items, they're selling an 18650 charger with 6 x 18650 batteries for $15. That's very cheap. Then you see that the batteries are marked as 18,000 mAh, when the best ones in the world are only 3,500 mAh and cost £7 each. The only explanation is that the seller...

The grinding noise is when the motor controller loses sync with the motor. there are a number of reasons why that can happen, but the most common is a bad connection to the motor. have a look at the motor connector that's about 10" from the axle. There's a line that shows how far in it has to...

Yes they can, but a slightly different and more predictable process.

No, all that means is that your motor has hall sensors and the controller is for a sensored motor. Sine wave or not depends on the software in the controller.

yes, it is a mystery. I've not seen anything quite like that before. It's like something has gone wrong in the controller logic. There is one thing I can think of, and that's water in the control panel or some other damage. Maybe level 3 is damaged in some way and giving out too high a...

The panel has it's own 5v regulator that it uses to send the signal. Anything in the controller is digital apart from the throttle signal, so the exact voltage doesn't matter. 4.3v on the 5v rail is not unusual.

That's right, only a Brompton lends itself to regular folding and carrying because of it's ultra-compact fold. Ideally, you want one with a removable battery to reduce the weight. Electric Bromptons are expensive and IMHO over-priced, but a converted one makes sense, especially if you start with...

I don't know what you're missing, but what that battery is missing is new cells. It will be made of the 17 pence recycled cells that are probably sold by the same seller. Normal cells cost around £3 each or more, so 13S3P would cost £117 plus the cost of the BMS, insulators, nickel strip, wire...

I think you're discrediting him. The only mistake he made was using the wrong type of hall sensor, assuming he fitted SS49s. How did he get involved and what did you ask him to do? It's all academic anyway because I'm pretty sure that your motor is scrap. A spin-out is normally terminal. The...

If a track blew where you indicated next to Q2, it can only be because your cable has shorted, in which case your whole motor is scrap unless you can find someone to do the very difficult repair. Even if you can find someone, it will probably cost more than a new motor anyway.

You're under-estimating the effort you need to fold and carry, plus you're under-estimating the space you need to store it folded.

It does have a shunt (or 3). It's just that you haven't recognised it/them.

Crikey! It's nearly as noisy as a Bosch.

It's in the bottom bracket left side. The wire tucks into the open frame tube that goes up to the controller behind the battery. The connector is a Julet type and just reaches into that tube to connect with the cable that comes down from the controller. That's unless they changed something on...

They don't have specialists, and I doubt that either would be able to fix your problem, though you can always try. People that know about these things are very thin on the ground. The motor connector is the thing under the frame where it says, "eco-power assisted".