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They normally send you an email it link in it that you have to click before you can log in.

Bikes without LCD or LED control panels often have the two wires on a 2 pin connector so that you can fit your own switch. In that case the most common colours are red and pink or red and yellow..

You have three basic choices. If you can't or don't want to fix the electrical problems when they come some time after buying, you have to buy from either a local dealer or fron an online seller that has a system and proven record for sorting out such problems. That's two choices. The third...

It's very unlikely that the motor is faulty. Who diagnosed that and what is their level of competence and knowledge? It might be better to start by describing the symptoms and how they started.

Ebay, Aliexpress, Amazon, Google shopping. Take your pick.

Throttles aren't illegal. They can work independently up to 6km/hr and at any speed above that as long as you're pedalling. More and more controllers now allow both of those conditions at once, so you can pull away without pedalling, then air pedal to keep the throttle activeup to 25km/hr (+10%).

I would say that your pedal sensor isn't aligned properly. Have a look behind the chainwheel, where you'll see a black disc with magnets in it. That needs to rotate an even 1mm from the sensor. It ust sits on the shaft with friction, so it's easy to wiggle it into the correct position and...

You get 100% of the quoted charge from a lithium battery; however, there is a slight caviat. You only get that number of watt-hours at a low discharge rate. If you run with high current, it can reduce by around 20%. The losses increase with the square of the current through each cell. That...

You pull the three bullet conectors apart to disconnect the motor, then put your probes on the yellow and blue, then yellow and green, then blue and green.

Get a half width or thumb throttle. Full width ones tend to break when you hit a bump at full throttle because the stops are only thin plastic. Once the stop is broken, you can't get zero throttle anymore, and if you use your brake to stop the bike, you'll burn out the controller and/or the...

Your "common sense" figures are way off and you're missing some vital knowledge. How much "experience" do you have - not much, it seems. Firstly, you can't empty an SLA battery. You only get about 6Ah out or a 12Ah one. Where can you find a 7.8kg 24v 8Ah lithium battery and why are you using...

Disconnect the motor controller from the battery and thee motor. Set the meter to 200k resistance scale and measure between each of the thick green, blue and yellow and the battery red, then repeat the three readings to the battery black. each group of thre should be the same as each other and...

3 x 12v 12Ah SLA batteries weigh around 12kg and give around half the range of 12Ah lithium battery that would way around 3 - 4 kg, so the SLAs are 12 times the weight for the same range. Also they can't be left for extended periods without changing due to self discharge, and you only get about...

It depends how the throttle is configured. Whatever is the case, you can always disconnect it to make the bike legal.

That's very worrying. It's the first time I've seen anything other than blue in hundreds of controllers. Now it means the only way to be sure is to open the controller to check.

You can't calculate the range like that. I would estimate that your capacity was 40% down at that voltage. The only way to be sure is to use a wattmeter and run the battery all the way down once.

That's perfectly normal because there are bleed resistors that drain down the cells to do the balancing. Imagine a bucket of water with a small hole drilled in it about an inch from the top. You can fill it to the top, but when you go back later, it'll be level with the hole.

How do they know which way round o put the wires?

It's not the saddle that flips, it's the seat-pin. Most people refer to the seat-pin as the seat-post, but the seat-post is actually the tube that the seat-pin sits in. https://www.aliexpress.com/i/32888215298.html

When you buy a new battery, you will need to solder some wires, so make sure you have that organised before you order.