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Attached is a photo of the setup the seller put together. He recommends I buy a new controller with similar specs and try to replace it myself.

So Halfords was useless, the technician didn't know how to use a multimeter! No idea where to go with it now, trying to source somebody near North Dublin to assess and ideally fix the wiring/controller as I don't know how to myself.

Thanks. Booked an appointment with the technician at Halfords, although won't get it looked at until Monday. If there's any simple tests I can do myself in the meantime please let me know!

Yep, new 35A BMS, Fully charged it and the controller screen shut off the second I turned it on, without the throttle. So I should open up the brand new battery now and test group by group?

Nightmare, just paid for the new battery and I still have the exact same issue. What next? I assume it's either a wiring or controller issue.

New battery is ready for collection so I will update in a few days how it runs. Update on the backup battery, is it still worth it?; "Those green cells are not chinese 2.6Ah as you sent me photo, but Panasonic NCR18650B. Those "Samsung 35E" cells are actually rewrapped Panasonic NCR18650B...

Oh and he can either fit 4x13 Tesla cells or 6x13 Panasonic - still not really any difference in either of these packs?

How would I switch the packs inside my case if I needed to use the backup? At present, battery pack is permanently attached to both connectors (charging port and output port), plus some wiring for light and switch etc. I cannot find an exact replacement for my battery case.

Anybody got a recommendation on what I should go for here? "After testing your pack I can see that original pink cells are roughly ok, no need to throw them away. I even have some Samsung 35E cells to replace those 2 green chinese cells. So the battery would be repaired faster and cheaper. So...

He said "I don't think there is any official datasheet for these cells, as they're used solely internally in the Tesla factory for their own cars. Various sources describe them as "Panasonic NCR21700T" or with "A" at the end of this model number as the closest possible match. I have them as...

Guy repairing the battery has some other cells in stock; "After checking my stock, I have sufficient amount of Panasonic NCR18650PF cells, but when measure internal space of battery case, I think I can also fit "Tesla" 21700 cells. At least 4 per bank, maybe 5 or even 6, but last option that's...

Hopefully the work will be done in the next week. Looking for a new rear rack battery case to keep the back up battery in, does anyone know where I could source a case exactly like this one? 291.16￡ 25% OFF|EU No Tax Electric Bicycle eBike 48V 20Ah 250w 1500w Rear Rack Battery Bafang...

Thanks. I remember the battery seller offered to ship the replacement cells - if I got 6 of these I could make a replacement 13s6p battery I imagine? Probably I would have to ask for a replacement case also so I can just slide once case off and the other on?

He said there is no insulation between series so he will have to strip battery down to bare cells and rebuild it. So will take him about 3-4 hours (€120-150) - probably a better option than having the batteries lying around or disposed of? What sort of range would I be expecting from a 13s5p...

Yep he said I can keep them, although he suggested I leave them with him to dispose of as he says they can be dangerous.

Thanks, I'm waiting for the seller to get these cells through customs and then he can get the battery made up. I just tried to hop on the bike for the first time in a few days today, from fully charged it cut out as soon as I turned on the screen without any throttle! Backlight would still...

If I charged between each return trip the longest daily trip is 15km, so should be fine. I guess I can calculate how many A I am using by dividing the Wattage shown by 48V? I generally don't restrict my speed, so I imagine it would be outputting 30A quite a lot? Can I increase my range if I...

Thanks. I asked the seller if he mixed up the specification and this is what he said; my apologies, usually it's stated as 2750 or 2900, depending on source. I was able to reach 3000mAh value, of course it may slightly vary between production batch or other circumstances. But I have good...

So a Panasonic NCR18650PF 3000mAh cell does not exist? Should I ask the seller for a photo of the cells he will build the battery with?

Thanks. An anomaly I just noticed is the advertisement of the problem battery says the cells are 2500mAh, but the cells are marked as 35E :confused: https://www.aliexpress.com/item/4000093945365.html Thanks @Nealh, the 3000mAh Panasonic NCR18650PF cells is been the only offer I've received so i...