Author Topic: BMS balance connector is unlabeled. Can you figure out which side is B-?  (Read 766 times)

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Offline weinbergercTopic starter

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I ordered this cheap BMS from ebay. It uses a the same balance connector as my battery pack, but the location of B- on the battery's connector and on the BMS's connector extension are opposite! The connector extension has one black lead (this extension shipped with the BMS) which I assume is B-.

Since the BMS board is unlabeled, I'm not sure if the lead extension is just wrong, or if the board actually has its B- wire opposite of my pack.

=/ What can I do?
 

Online oPossum

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Re: BMS balance connector is unlabeled. Can you figure out which side is B-?
« Reply #1 on: January 27, 2019, 11:40:51 pm »
The harness shown in your last picture looks correct. Pin one of the PCB is designated by a square pad, and on the bottom it goes to some ground plane, so that is most likely to be the B- connection.
 


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