Troubleshooting: battery won't charge or run, despite correct cell voltage

[coaxialgamer]

Newbie here, wasn't sure where to put this.

Recently, I encountered battery problems with my older Gepida repida 1000. Here's a picture of the model:

The battery has stopped providing any power to the ebike, it just won't turn on. The battery has a quad light indicator on top, with the light rotating between the 4 LEDs when prompted, something I've never seen before. Given what i've seen, i'm 99% sure the battery is the issue. It won't accept a charge either. Here's a quick and dirty video of the led blinking pattern.

[youtube]https://www.youtube.com/watch?v=fh_1D3l20E8&list=UUNCalkQnpDtJGiBI4sxmoNA&index=1[/youtube]

The unit itself has been re-celled fairly recently btw. So this isn't just a case of dead cells.

I opened up the casing to check how the cells and BMS were doing, and sure enough, the cells are all near their nominal voltage, all sense wiring attached properly, with no obvious damage to anything (why can't anything be easy )

The battery itself is 24V: it's a yamaha X60-E0, which seems to be specific to Gepida unfortunately. It's arranged in a 7s4p config.
After basic troubleshooting steps, I've determine that the person who added new cells didn't reset the BMS microcontroller (an M37512), given it's still showing 700+ cycles. I am unfortunately unable to contact this person anymore (they've run out of business), but the bike itself has been running for months, daily without issue. But the high cycle count shouldn't be causing issues like this anyway, right?

Unfortunately, there's barely any documentation on the battery or MC to go on, so i'm kind of desperate here. Has anyone encountered something similar to this before?

I'm kind of in a tight spot here: this bike was my main commuter vehicle, not to mention my favorite way to get around. I don't have the cash to buy a new ebike at the moment, nor to buy an entire new battery (assuming i could find one, they're all hundreds upon hundreds of $$$, which seems silly considering the cells in my unit are basically brand new. Can't find anything about the BMS unfortunately).

 

[e-beach]

HI coaxialgamer, welcome to ES!

I do have a few question and comments:
Have you contacted the manufacture about you battery? This also seems to be a known issue with this bike. The workaround seems to be to purchase a new battery that works with your bike and charger, or get another charger and BMS, and wire the bms into your system.
https://translate.google.com/transl...gepida-akku-x60-e0-pedelec.34503/&prev=search

The unit itself has been re-celled fairly recently btw. So this isn't just a case of dead cells.

Does the recall apply to you? Can you take advantage of it to get a new battery?
And, yes. All quality e-bike batteries are expensive. Although, yours is no too bad to replace.
https://global.rakuten.com/en/store/aida-sangyo/item/10006199

I opened up the casing to check how the cells and BMS were doing, and sure enough, the cells are all near their nominal voltage, all sense wiring attached properly, with no obvious damage to anything (why can't anything be easy )

When you say normal voltage, what do you mean? What voltage are they and how did you check the cells?

...But the high cycle count shouldn't be causing issues like this anyway, right?

That is a tech issue that the manufacture could tell you the answer to. I would try to contact them for the answer to that. There might be a reset code or something.

Unfortunately, there's barely any documentation on the battery or MC to go on, ......

Yea, that manual isn't too complete with the exception on what not to do.
http://gepida.com/media/files/Gepida_PAS_pedelec_angol__1.pdf
Page 14-16


Have you gone through all the suggestions in the manual to try to get the battery going?
Pages 37-39 in the manual?