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Even if you were to send the battery to Bosh they will just bin it, my brother tried that route years ago. Bosh will not entertain any repair.

We call it current control, the Chinese call it torque simulation. It is the supply of current to the drive motor. More current supplied gives more drive torque at the wheel or torque simulation. A lot of cheaper kits use basic speed control for controllers , these often are 3 speed/ 3 levels...

Yes barring a couple of points. Not really sure of accepting Amazon reviews. Nearly all motors are BLDC type, brushed motors are old history.

If a controller can't be sorted may be time to think of other possibilities to keep it working.

It's not an uncommon issue with them. Some time ago aprrox.2 years ago a work mate took his kids bike in for an assessment for repairs and was quoted about £100 +parts but couldn't tell him the final cost until they had fitted the parts. Wobbly cranks, terrible braking, wonky wheels. My...

Yes.

We don't know if Joe ever got sorted as no further posts. But as mentioned in #3 Pete's versatile load carrying trike is for sale.

Legal AKM 100cst hub. AKM-100CST Cassette 36V250W EBike Rear Driving Hub Motor 32/36 holes [AKM100CST EBike 36V250W motor] - $105.00 : Zen Cart!, The Art of E-commerce (topbikekit.com)

After checking out brakes, personally I would drop the forks out and thoroughly check out the lower and upper bearings for rust and wear, semi -sealed bearings can become rusty as do loose bearings. Quite simply remove the handle bars from the stem, undo the top head bolt and then loosen the two...

201rpm with 12:1 ratio should be good to go, as vfr has said hub RPM winding is important

Sadly the sluggishness may not be down to the PAS disc missing , if the battery is the original then it will likely be knackered as a 2012 model.

Kits using ext controller can be used with nearly all hub motors and yes the peripherals can be any generic item as can the battery be, the controller only has to be matched with a suitable display. Like wise batteries with integrated controllers are as above but controller size type varies so...

The BZ10C I mentioned as it is quite universal for fitting most bikes, more so those that use the Hollowtech BB or Sram equivalent. The HG I believe is a cassette for freehubs so you will need the 100C model, but make sure 100% before ordering. Freewheels are screw on and the cassette slides on...

For lightest kit or should I say lightest hub you will have to buy form China. Any EU sourced hub will be 3.3 kg - 4.4 kg approx. , a reputable brand from China like an Aikema 100 hub will come in at 2.1kg for freewheel model or 2.2kg for freehub model. AKM-100H 36V350W EBike Rear Driving Hub...

Ditch the throttle etc ,etc and start again, fit KT current control controller with LCD4 dsplay a new PAS, and three wire thumb throttle. Buy all items form the same shop/vendor, it will then all be plug and play. Ebike controller 24V 36V KT controller 6 Mosfet 17A for 350W or 250W...

BMS has mosfets as well.

If the bike is quite new have you contacted the people you bought the bike from ? The fact you brake lights and front light , horn switch etc aren't available on most controllers s o some of it esp the brake light will be defunct.

Any quoted range has to be taken with pinch of salt or even a large spoon full, lowest assist and no wind on flat terrain and one might get nearer the quoted.

Users Manual-KD21C-KDS.pdf (key-display.com)

It does for a small battery and a light rider and they just feel a bit nippier in handling terms.