blackjack 29 batteries getting really hot

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  • 96motorhead
    Member
    • Apr 2013
    • 38

    #1

    blackjack 29 batteries getting really hot

    I have 2 turnigy 2s 5000mah 20c batteries and 2 hobby people 2s 5000mah 35c batteries and they both get extremely hot and a bit puffy when ever I use them. The motor and esc stay fairly cool. I have traxxas connectors and they are barely warm if warm at all. The only things that get hot are the batteries. What could be causing this and what can I do to fix it?
    thanks
  • kendt
    Senior Member
    • Jul 2011
    • 557

    #2
    Is it the stock prop. That's normally caused from batteries that cant supply the current the motor is trying to use. If they are puffed you want to be careful about using them. Especially under the same conditions that caused them to puff in the first place cause after that comes

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    • 96motorhead
      Member
      • Apr 2013
      • 38

      #3
      It's 100% stock.

      Comment

      • JimClark
        Fast Electric Addict!
        • Apr 2007
        • 5907

        #4
        how long are you running it?
        "Our society strives to avoid any possibility of offending anyone except God.
        Billy Graham

        Comment

        • 96motorhead
          Member
          • Apr 2013
          • 38

          #5
          4-5 min then let it cool off for like 10. It sucks because I want to run it the whole time not wait and they still get hot. I stay on a plane the whole time too.

          Comment

          • JimClark
            Fast Electric Addict!
            • Apr 2007
            • 5907

            #6
            How amany Mah are you putting back into the batteries? Or what is the voltage of the packs
            "Our society strives to avoid any possibility of offending anyone except God.
            Billy Graham

            Comment

            • 96motorhead
              Member
              • Apr 2013
              • 38

              #7
              it depends how low they run. But on average the charger puts about 4700-5200 it really just depends. I normally run them down to about 3.6v per cell. They charge back up to 4.2v. The hobby people batteries are brand new probably 4 runs on them max. I don't even use the turnigy ones anymore they puffed way to much.

              Comment

              • JimClark
                Fast Electric Addict!
                • Apr 2007
                • 5907

                #8
                are you charging in Parallel?
                "Our society strives to avoid any possibility of offending anyone except God.
                Billy Graham

                Comment

                • 96motorhead
                  Member
                  • Apr 2013
                  • 38

                  #9
                  I have no clue I just plug it into the charger and charge it. Are you talking the cells in 1 battery or are you talking about charging 2 batteries at once?

                  Comment

                  • JimClark
                    Fast Electric Addict!
                    • Apr 2007
                    • 5907

                    #10
                    Talking about charging tw0 at once. Because you say you are using 5000mah batteries and putting 4700 to 5200mah back in after a run?
                    "Our society strives to avoid any possibility of offending anyone except God.
                    Billy Graham

                    Comment

                    • 96motorhead
                      Member
                      • Apr 2013
                      • 38

                      #11
                      ya i charge one at a time. I don't know why but on like the first or second charge it put 5190mah in and after that it does high 4000mah now. yesterday it put in 4600 I believe.

                      Comment

                      • JimClark
                        Fast Electric Addict!
                        • Apr 2007
                        • 5907

                        #12
                        you are running them down way to far then. Look in the proboat forum for lots of tuning tips
                        "Our society strives to avoid any possibility of offending anyone except God.
                        Billy Graham

                        Comment

                        • 96motorhead
                          Member
                          • Apr 2013
                          • 38

                          #13
                          yesterday they were ran down to 3.6v per cell.

                          Comment

                          • martin
                            Fast Electric Addict!
                            • Aug 2010
                            • 2887

                            #14
                            Your over discharging the batteries if your going down to 3.6v per cell, at 3.6v their practically empty. You should not go below 20% left in batteries, you need a minimum of around 3.7v.

                            Comment

                            • 96motorhead
                              Member
                              • Apr 2013
                              • 38

                              #15
                              I don't have a voltage reader. When I put the battery on the charger is when I know what is left in them. What is a sign I should stop running the boat on the batteries?

                              Comment

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