I have a 12s5p 30Q battery pack from eskating.eu that needs repairing. The vendor is ignoring my emails -and sending it back to Italy would probably not be very easy anyway, so I thought to see if there’s anyone here, located in the UK, willing to take the job.
I believe the cells are OK and the problem lies with the BMS or the switch. The problem started in that the button wouldn’t always turn the board off -and even when it did, the button LED would remain on for a while. I foolishly ignored the problem and eventually one day it just turned off for good mid-way. The switch’s LED would still lit but no power on the LCD screen and no power output. I’ve left it aside for the last 4-5 months, but lately I decided to put together a belt-drive, since I already have the parts sitting.
I have no experience with batteries/BMS so I am looking for someone with experience in building 18650 battery packs that can open the shrink wrap, have a look at the BMS/Switch and replace what’s necessary.
Battery was half empty, I tried to measure it just now and got… 3.3V, though I’m not sure if I can trust that. Could a faulty BMS or a blown fuse result in such ridiculously low for a 12s measurement?
Thanks, managed to do it without blowing up anything
It’s 48.5V so looks fine!
Now I only hope I can find a builder to rewire a new bms/switch for me. If they also build custom enclosures that’d be a bonus as I’ve messed up the old enclosure.
I could do this but judging by what @taz has said I’m not sure I want to take it on. I am also down south and not sure on the status or even morals of shipping this battery
something happened around 3 months ago. I used him before that without any problems but my last 2 orders were PITA. eventually got them but was frustrating as hell especially considering he charges premium for all his products.
That’s a shame but good to know. Alberto was very helpful at first, I’ve bought about €1300 worth of things from him and chances are I would buy more in the future otherwise.
I’m clueless but I assumed the battery pack (spot welded as it is, with all wires) could remain intact and just wire a new BMS/switch in the place of the old one.
But if it’s true that the pack would need to be taken apart, then how about I cut the stripes to release the individual cells and ship them like that, which would be safer? Or removing the spot welded strip bits afterwards would be too much of a pain?
The side strips are covered by something like cardboard and tape -there was only one place I could easily lift it to expose them (not sure if that’s enough)
Ah ok it’s the Antispark then. Desolder those two wires, one at a time and insulate them so you cant short anything then resolder a new antispark in and you should be good to go
No worries mate. They sometimes come like you see there with the fuse across the positive side and the negative side is switched on and off. In reality you can put the fuse anywhere, put it after the Antispark on the positive side and you will be ok
