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It might help to say what sort of bike you have.

You can't charge batteries when they're in parallel because one will charge the other through the discharge wires, which by-passes the charge controls. There are ways round that, but probably easier and safer to keep the batteries separate, but with common grounds unless you need to squeeze out...

The bike has suspension at the back, so you can't wedge anything in there.

You can't use one throttle with two cotrollers without making the grounds of the batteries common, otherwise you'll get random glitching and other problems, which is dangerous. You wire the throttle to one controller as normal, then splice a second wire onto the signal wire and run that to the...

You get a device thats like a mini bike rack, like you used to have at school. it has slots for the front wheel. the best ones allow you to fit two tie sraps, which prevent the bikes leaning over when you go round cornerd, which can damage the wheels or tyres.

These 24v bikes normally have 12A or 14A controllers. Power = volts x amps, so you get say 288 units of power. At 36v, that would be 432 units of power, but most 36v systems on cheap bikes are 14A or 15A, so say 504 power. There are some cheapish 36v bikes that have around 17 to 20A, so say 612...

Try it first to see if it has enough power. 24v has a 29.4v charger, 36v has a 42.0v one.

My mate got a Carrera Kraken with hydraulic brakes and forks in perfect condition for £110. I got one for £100 with only hydraulic brakes, ut it was an earler model. Both were perfect for conversion.

There should be a tubular moulded connector under the right hand chainstay. There is a line marked in the moulding that shows how far it has to be pushed together. If you don't reach the line, you get all sorts of problems - even 1mm short is bad.

You'll be able to tell us soon if it is or isn't. The Small wheels help when you only have 24v, but you're probably going to find the speed a bit low. There is something you can do to get a bit more power that doesn't cost anything, but that will compromise the range. One thing to be careful...

With Ebay, you get a max of something like £15 to send stuff back. I'd be very surprised if you could find a dealer, whio could sort it out for you

I estimate that you'll need using around 15 wh per mile when you start, so 40 miles requires 600wh, which is around 15 Ah at 36v and 12 Ah at 48v.

Does your controller allow regen, which will increase the motor's resistance?

The Appollo is only 24v, so would be only suitable for light people or those that don't want much assist.

It's not bad for a first kit. A rear motor is always better than a front, especially if the donor bike has suspension forks.You need a cassette motor for 8 speed gears or more and a freewheel one for 7 or less.

We need weight, distance, fitness, tech ability, preferences, etc before we can advise.

There are very many possible causes for that problem. The only way to find the exact cause is to start measuring and testing. test 1. Disconnect the battery from the controller and measure the voltage on the battery side connector. Measure it again while connected with the controller switched...

Open the control panel to test where the wires attach to the PCB if you have moulded connectors and the 4 into 1 harness. That's as long as you have one that screws together. The welded ones are impossible. For those, you'd have to cut into the harness to test, then repair the wires afterwards.

If you make statements like that, you have to qualify them and put them into context, otherwise yoy might persuade somebody to get something that's quite unsuitable for them, which will make them very disappointed. You said that you spend as much time as possible riding your bike with no power...

A ready made hub-motor wheel will have a different rim, so if looks are important then you'll have to fit a crank motor. Normally, the type of motor you fit depends on how and where you ride and what you want your bike for. You haven't told us anything about that. Why/how did you choose that...