mislabeled BMS ! what to do?

Hi

I'm repairing a bike for a friend. He has given me all of the components including this BMS which seems to be mislabeled.
Normally i would expect to see connections for B- (battery -ve), C- (charger -ve) & P- (controller -ve).
Sometimes there is only B- and -ve.

On this board there are three solder tabs but the little one is marked P- and one of the big tabs is marked P- on one side but C- on the other side. Where the P- and the C- are connected.

Sould i connect as a 2 tab BMS and ignore the small P- tab,
or should i assume the small tab is a mislabeled charger tab and use the big tab for power even tho its marked C- on one side?

Has anyone else used a BMS like this?

Could you post an image of the PCB?

Sorry

In the first picture I can see B- on the bottom left, P- in the middle and P- on the right lol.
Second picture B- matches, P- matches and the second P- is C- there.
Could you take the cover off and make another picture?
The current shunt resistors should be at B-.

Here is with both covers off

Oh and this was boxed when i got it. Those wires i soldered on just this morning. So don't assume anything from the wire gauges used.

To me it looks like a two port BMS. The charge FET bank is much smaller than the discharge FET bank.

It should be wired like this:



It's really stupid they have the incorrect markings on one side.

Ok cheers fechter
Its odd too that they made the p- tab small and the c- big.

It looks like they use the same board for a single port version.

You could attach the P- connection to the middle of the big solder patch on the back side.