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The price suggests good cells might be used like the MJ1, but without more cell specs it is a guess the only other cell is the newer M36 cell.

The purple might be a speed restriction wire or even a cruise wire, the other one is a brake wire like the other in the pic. One is for low side brake input and the other type is for high side brake input, ebikes use mainly low side brake input.

36v bikes use 50v caps and 48v use 63v ones.

The bike uses a torque sensor meaning it only responds in kind to the effort you put in, for an easier effortless rise a 905se with cadence sensor might have been better. The wheel rotational sounds similar to another recent posters issue with his new Wisper, it might be that it hasn't been set...

Any pedal sensor will work if fitted correctly.

You will have to add a stem extender which will simply clamp on with Allen key bolts. Measure the stem diameter to make sure you buy one that will fit. Something like this...

The issue is the controller mosfets and their temperature rating, when they reach this they reach the thermal overload and temporarily short out/cut out. Once they cool a again they are fine until it happens again if they don't fail altogether. The weight, uphill terrain. riding with max...

Same with hub motors if the drive is lacking then a good splodge of grease quietens things a treat.

I shopped at my local Lidl last evening and locked my bike parallel with the Lidl advertising furniture, the front wheel lock looping around said furniture upright an back through the frame also a D lock through frame and rear wheel. When I came out of the store my bike was sitting at a 30...

School run bike ? Looks quite cool a nice cargo bike .

I tow a trailer with my rear hub Bafang bike but not all the time, primarily it is used for my beekeeping. Late summer this carries about 80lbs deadweight and that is certainly noticeable as I feel it push/pulling as I move along. A hub or mid drive will work but I think the hub is the better...

LG make some great cells, though like many well known brands they also produce medocre ones. It really does depend on the actual cell used.

The controllers are voltage specific though 13s might run at 14s ok.

Might be easier just to ask for help with the issues you have, some manuals are quite useless and basically only tell you how to switch a bike on.

39v is very poor, if that is the most it will charge to then it is either wildly out of balance or the cells are knackered and only destined for recycling. A 36v battery in good working order fully charger will be 41.4v - 42v. 39v won't even balance out if you leave on the charger for several...

Isla you may find it might work at 36v if originally 24v but checks need to be made first, the controller will need opening to check the actual voltage rating of the capacitors (small cannisters) written on them. Other wise as mentioned they will pop if voltage rating is too low.

32T.

Yes to all.

GBK are as good as all the other vendors. The price with delivery is silly for 10s 7p 35E if they are genuine cells, allow vat and duty on the deal as well, so possibly another £45 or £50.

If you can get one at 14.5ah it will see you a good mileage maybe 55 or more in low power.