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They are obsolete now and doubt you will find any spares, your best bet might be to try and somehow re-solder the broken part back on .

The bullets are a bit crap for battery connections. Either pull them a part slide a length of glued heat shrink along the wire, reconnect and shrink them. Use self amalgamating tape to wrap the joint or cut the connectors off and directly solder the wires together having slid heat shrink on...

If the battery charges only to 49.4v then it is either very unbalanced and has one or two cell groups way out of line (voltage wise) or the cells are knackered. 49.4v equates to an average cell voltage of 3.8v, something isn't right.

No...…. Something is very wrong if you can only charge to 49.4v. Measure the voltage of the charger at the charger connector, plugged in to the wall socket you should see 54.6v. Your battery for 48v nominal should charge to 54.6v max , anything less then 53.95v then it is not very well. A 48v...

The lcd light function is only a back light for night riding to read the display, afaik never tried it. It doesn't actual switch riding lights. The controller light function I think needs an aux switch to which the light then connects to, my SM connection controllers with the light feed work...

Avoid Halfruads like the plague and repair yourself for about £20.

Solder the wires back on , it doesn't matter which way, plug back in and press the plunger in the bike should power on again. Alternatively a quick fix is disconnect both Red connectors and the bike should still work but without the cut offs for motor over run. Just don't use the throttle...

The Red two pin Julet cable utilises a simple reed switch (on/off) , it is a brake cut out sensor. When you brake the sprung plunger comes out and power is cut to the controller, release the brake and it pushes the plunge in for power again. It acts as a simple circuit breaker. If you have two...

16t sprocket is a kin to a 10/30 cassette. The aprrox teeth ratio's are a bit closer. 30, 25, 21, 19, 16, 13, 11, 10.

21 sprocket on Alfine/Nexus is a kin to using a 13/40t cassette. The ratio's relate approx. to 40, 33, 28, 25, 21, 17, 15 & 13t sprocket sizes.

Show a pic of the BMS multi sense wire connector, for an exercise you can get all the cell group voltage readings via the connector when you pull it out/disconnect it. It will tell you the voltages of all 10 cell groups, but it does sound like the battery is toast.

Time for another battery or get it re-celled with nice cells, the LG F1L is low power cell. The Samsung 29E is a low power cell but much better. Generally 2900mah cells are the sweet spot for battery life and longevity but there are a couple of stand out cells of 3500 mah, both LG the MJI & M36...

If it starts cutting out again and often then the battery is not really up to it, you need top cells for a 1kw hub and maybe more then 13s or more cells in parallel. I would have though you need a battery with LG HG2 cells or Sony VTC6 and at least 6 in parallel. Tbh a battery with those won't...

48.3 is about 50% charged, it should charge to 54.6v for a13s/48v batter. The battery might be unbalanced so you first need to fully charge it. What is the batteries continuous discharge rate ?

Browsing AliExpress, good to see now Ofkeet seller is offering twenty one 14a & 22a Lishui 36v controller and lcd combo's as an alternative to KT ones. Choice is similar SM connector or Julet versions. Looking at them the 14a is 6 fet and 22a likely is 9 fet, No 48v one yet but they will work on...

Yes there are 22a/ 9 fet KT sign waves available. http://www.topbikekit.com/t09s-36v48v500w-torque-simulation-sine-wave-controller-with-julei-waterproof-connector-p-760.html https://www.aliexpress.com/item/32857864688.html?spm=2114.12010612.8148356.20.2a8f60afEQqtII

Depends on the tube damage, show us some pics. A puncture can be caused by many things, spokes too long, thorns or glass cuts. Snake bites if tyre pressure is to low and even rough inner rims edges if you ride on flat tyres. Or a torn valve vase if a rim tape is not used.

With hub drive you can use any gearing you like.

The battery needs a 2a charger. The KT LCD5 connector isn't compatible with Julet controllers. The controller needs a 1T4 trunk lead to allow an lcd connection. KT 22a battery controller for 65pcs case...

06 is likely under voltage/lvc as mentioned either an unbalanced battery or as Andy mentions saggy cells/voltage. Tell us the voltage reading after charging.