E-Bike battery connected the wrong way

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  • MirceaL
    New Member
    • Dec 2022
    • 5
    • Romania
    #1

    E-Bike battery connected the wrong way

    Hello,

    I have a 36v ebike battery , and I managed to connect the charger in reverse way . Thank you Giant for not making the connector fool proof.

    The connector has the following pinout:

    P+ , A, B , C, D , P-

    P I am guessing is the power input
    A-D is to check the voltage from each cell bank

    I have taken the battery appart, but the circuitry is deep in some silicone ... to protect it from water.

    Before I go any further with digging , do you think there are any chances to repair this battery ?
    Could there be any protection circuit that might blow to protect the rest ? in this case any idea how I can identify that ? what to look for ?

    By looking the the components , there doesn't seem to be anything obviously burned / broken

    Thanks for the help
    Mircea
    Tags: None
    • petehall347
      Badcaps Legend
      • Jan 2015
      • 4426
      • United Kingdom
      #2
      Re: E-Bike battery connected the wrong way

      post some close up in focus pictures .

        Comment

        • MirceaL
          New Member
          • Dec 2022
          • 5
          • Romania
          #3
          Re: E-Bike battery connected the wrong way

          Attaching some close-ups. Thanks
          Attached Files

            Comment

            • petehall347
              Badcaps Legend
              • Jan 2015
              • 4426
              • United Kingdom
              #4
              Re: E-Bike battery connected the wrong way

              have you checked the charger ?

                Comment

                • MirceaL
                  New Member
                  • Dec 2022
                  • 5
                  • Romania
                  #5
                  Re: E-Bike battery connected the wrong way

                  Yup. I have borrowed one from a fried and the battery behaves the same

                    Comment

                    • petehall347
                      Badcaps Legend
                      • Jan 2015
                      • 4426
                      • United Kingdom
                      #6
                      Re: E-Bike battery connected the wrong way

                      there might be a fuse that's blown

                        Comment

                        • sam_sam_sam
                          Badcaps Legend
                          • Jul 2011
                          • 6039
                          • USA
                          #7
                          Re: E-Bike battery connected the wrong way

                          Originally posted by petehall347
                          there might be a fuse that's blown
                          Or you fried the BMS board

                          With that said you should never assume that red is positive and black is negative you need to check it with a meter I have also done this myself before because some manufacturers do not always follow the normal guidelines for red is positive and black is negative also some battery cells are not normal either Lithium-Ion Lipo 4 battery cells are different than normal Lithium-Ion battery cells
                          Last edited by sam_sam_sam; 10-02-2023, 04:33 PM.

                            Comment

                            • eccerr0r
                              Solder Sloth
                              • Nov 2012
                              • 8701
                              • USA
                              #8
                              Re: E-Bike battery connected the wrong way

                              was there any heat or smoke involved?
                              What are the voltages on each cell of the pack, are they normal?

                              Strange you had access to the interstitial nodes, which means that it was monitoring something...wrongly... also I don't know what's doing balancing either, if you have access to the interstitial nodes, the charger had to deal with balancing too.

                                Comment

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 31040
                                  • Albion
                                  #9
                                  Re: E-Bike battery connected the wrong way

                                  thats a lot of stuff on that board!
                                  i'm not sure what the extra wires are for - more pcb pictures would help as it seems to have the wire-points labeled on the board

                                    Comment

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