Reention Dorado 48v 17.5AH - BMS Help needed

[Kriis]

Hi All
I managed to find a second one of these at a reasonable price with a failed BMS. All cells check out well and case/plugs/ancilliaries all useful but struggling to find a new BMS.
Not only this, but it appears that my wiring is unusual in that i have a stout wire coming direct from positive on end cell to the original board, whereas all boards i can find all use Negative for all 3 main connections, i.e. B-/P-/C-.
I'm reluctant to unwrap the cell pack just to run a new negative, and there's precious little room in the case to run internally (and safely).
I hope anyone who's worked on these, reads this - Thank you in advance.

 

[Gionnirocket]

The replacement BMS doesn't need to be an exact match as long as the specs are the same and it physically fits in the case. There's hardware out there that's only available to manufacturers so it may not be easy to track down.
There are places that rebuild batteries... have you tried contacting some of them for a compatible replacement?

 

[Kriis]

...I hope that anyone who's worked on these reads this - Thank you in advance...

 

[Gionnirocket]

 

[harryS]

When you get a new BMS, you will wire it to the cells per the requirements of the new BMS.

Copying over the old wires to a different BMS can cause trouble if they are not the thing. Sometimes, they skip the first balance wire. They may reverse the order of the wires.

WHen selecting a BMS ---
1. Make sure it is a balance BMS. The specification will list the balance current.
2, SIze the current to tha capacity of the battery. You dont put a 30A BMS on a battery that can only handle 20A.
3. If your battery uses an on/pff switch, buy a BMS that supports an on/off switch, A teempeture switch is a good idea too,
4. Pay decent money. I exoect to pat $25USD (20£) or more.

 

[PCeBiker]

Hi All
I managed to find a second one of these at a reasonable price with a failed BMS. All cells check out well and case/plugs/ancilliaries all useful but struggling to find a new BMS.

Can you post some pictures of your BMS?

I've got three Reention Dorado batteries, and I've removed the end caps on all of them, but didn't want to try and remove the cell pack to check out the BMS.

One of my batteries is a proprietary Das-Kit battery that may have that unusual wiring as well?


And,.. you might be able to find a part number or code printed on your BMS that you can enter in a search to find an exact replacement.

 

[Elyot919]

Hi All
I managed to find a second one of these at a reasonable price with a failed BMS. All cells check out well and case/plugs/ancilliaries all useful but struggling to find a new BMS.
Not only this, but it appears that my wiring is unusual in that i have a stout wire coming direct from positive on end cell to the original board, whereas all boards i can find all use Negative for all 3 main connections, i.e. B-/P-/C-.
I'm reluctant to unwrap the cell pack just to run a new negative, and there's precious little room in the case to run internally (and safely).
I hope anyone who's worked on these, reads this - Thank you in advance.

Yeah, those Dorado cases are incredibly cramped. The issue is that most generic BMS units use low-side switching (negative), while the original setup you've got there is different. If you can't find an exact Reention replacement, you're pretty much forced to rewire for a common negative BMS, but like you said, safety and space are the biggest risks there.