bad connection

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  • urbs00007
    Senior Member
    • Jun 2011
    • 826

    #1

    bad connection

    ran my twin avenger today. 4082 1600, seaking 180's, 5s2p wired for 10,000 mah. ran first 2 sets of packs. ran fine. 3rd set ran a little low on power. brought it in after a minute of running. 5mm bullets to esc at motor end were hotter than normal. 120 degrees. 1 of the bullets were loose. battery sustained this damage. got hot at the wire connection to battery. readings on cell checker were 3,765, 3.774, 3.755. should I replace batteries after I fix bullets to motor?
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  • rol243
    Fast Electric Addict!
    • Apr 2017
    • 1038

    #2
    you only have 3 battery check readings, need 2 more.

    Comment

    • urbs00007
      Senior Member
      • Jun 2011
      • 826

      #3
      bad connection

      Originally posted by rol243
      you only have 3 battery check readings, need 2 more.
      sorry. misread. as follows 3.765, 3.768, 3.750, 3.770, 3.752.

      Comment

      • srislash
        Not there yet
        • Mar 2011
        • 7673

        #4
        I would cycle the battery and see how it is. It has two motors this hull? If so and one side lost a connector than the other ide would've worked harder and boat certainly would've been slower. Was there a cool down period between runs?

        Comment

        • rol243
          Fast Electric Addict!
          • Apr 2017
          • 1038

          #5
          those cell readings seem normal to me , naturally not fully charged to 4 plus volts but certainly not in the danger zone . i storage charge my packs to 3.8 volts per cell.

          Comment

          • NativePaul
            Greased Weasel
            • Feb 2008
            • 2760

            #6
            For the insulated wire to get hot enough to melt heat shrink, the tab must have been a LOT hotter than LiPos should get.
            I would treat that pack with extreme suspicion.
            Paul Upton-Taylor, Greased Weasel Racing.

            Comment

            • urbs00007
              Senior Member
              • Jun 2011
              • 826

              #7
              Originally posted by srislash
              I would cycle the battery and see how it is. It has two motors this hull? If so and one side lost a connector than the other ide would've worked harder and boat certainly would've been slower. Was there a cool down period between runs?
              yes twins. first 2 runs were fine. 3rd run was lower power. brought it in after 2 minutes as I thought these set of packs were just not as good as first 2. never had a set of packs that ran lower. next time i will stop run immediately. yes, will keep a close eye on this set of packs. thanks everyone.

              Comment

              • urbs00007
                Senior Member
                • Jun 2011
                • 826

                #8
                I think i will solder my connections from esc to motor. when I built this boat all bullets to esc from batts to motor were tight. I put a little electrical tape around the connection to prevent any arcing. how does a bullet loosen up?

                Comment

                • rol243
                  Fast Electric Addict!
                  • Apr 2017
                  • 1038

                  #9
                  probably cheap quality Bullets.

                  Comment

                  • srislash
                    Not there yet
                    • Mar 2011
                    • 7673

                    #10
                    Originally posted by rol243
                    probably cheap quality Bullets.
                    I even have Castle ones that have loosened up.

                    Comment

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