Battery Temps to High. ?

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  • 704Authentic
    Senior Member
    • Nov 2012
    • 178

    #1

    Battery Temps to High. ?

    After a bit of hard running on cool lake water, Temps are as follows:

    Motor 75
    ESC 80
    Batteries 125-130

    Is that normal? ... something incorrect?


    Thanks,
    AquaCraft UL-1 59mph.
    Motley Crew 61mph.
    JAE 21FE ~~~ 70 MPH Club ~~~
  • photohoward1
    Fast Electric Addict!
    • Mar 2009
    • 1607

    #2
    Motor and ESC are perfect. How long did you run and what is the set-up. Batts get hotter as they approach low voltage cut-off. Best not to let bats go below 20%.

    We nee the total set-up picture to evaluate.

    Comment

    • 704Authentic
      Senior Member
      • Nov 2012
      • 178

      #3
      What's the high and low numbers for ' Happy Battery Temps.'
      6 -10 min. run times.

      AquaCraft Wildcat EP, Leopard 3650 / 2450 kv, ProBoat 60amp esc, Stilleto 1.6 x 2.5 prop. 14.4v.
      AquaCraft UL-1 59mph.
      Motley Crew 61mph.
      JAE 21FE ~~~ 70 MPH Club ~~~

      Comment

      • TristanJones
        Senior Member
        • Oct 2012
        • 266

        #4
        50-70degC i've been told, thats for cheap chinese batteries, not sure if that matters or not.
        My 4AH would see 75degC after 5-7mind hard running, no puff ups still balance fine and run great....

        Hope that helps somehow.

        Comment

        • drwayne
          Fast Electric Addict!
          • May 2008
          • 2981

          #5
          Originally posted by TristanJones
          50-70degC i've been told, thats for cheap chinese batteries, not sure if that matters or not.
          My 4AH would see 75degC after 5-7mind hard running, no puff ups still balance fine and run great....

          Hope that helps somehow.
          OMG that's some bad advice right there. :shock:

          75'c is terminal for lipo cells....

          Overheated cells fail, and reheat quicker.. .. before they self immolate

          'Optimal' finish temp is below 50'c ( 130f )

          There is a battery header on main forum.. go there for good solid advice.

          burn and learn.

          DocW
          Wayne Schutte PhdCSE BaSE BaEE. Australian, & damn proud of it YOUTUBE
          @ 36" H&M Maritmo twin1512/1800 6S1P 88mph @ 40" drag hydro#1 twin 5692 12S1P .....always for fun @

          Comment

          • TristanJones
            Senior Member
            • Oct 2012
            • 266

            #6
            well there ya go

            Comment

            • 704Authentic
              Senior Member
              • Nov 2012
              • 178

              #7
              Thanks guys!
              AquaCraft UL-1 59mph.
              Motley Crew 61mph.
              JAE 21FE ~~~ 70 MPH Club ~~~

              Comment

              • keithbradley
                Fast Electric Addict!
                • Jul 2010
                • 3663

                #8
                That's not bad for such a long run. Judging by your temps I would guess that you are running in some pretty cold water...that's the only explanation for your very low ESC and motor temps. I would also assume that if you took ESC temps at the caps they would be significantly higher.

                I use 140F as the cut off for lipos, but I try to keep them cooler than that if possible. Doc's advice of under 130F is pretty reasonable.
                www.keithbradleyboats.com

                Comment

                • 704Authentic
                  Senior Member
                  • Nov 2012
                  • 178

                  #9
                  Thanks. ...better now.

                  FYI - Temps taken from all over ESC, caps were the hottest, 80.
                  Water temp 50-55 :)

                  Thanks again,
                  AquaCraft UL-1 59mph.
                  Motley Crew 61mph.
                  JAE 21FE ~~~ 70 MPH Club ~~~

                  Comment

                  • keithbradley
                    Fast Electric Addict!
                    • Jul 2010
                    • 3663

                    #10
                    Originally posted by 704Authentic
                    Thanks. ...better now.

                    FYI - Temps taken from all over ESC, caps were the hottest, 80.
                    Water temp 50-55 :)

                    Thanks again,
                    In that case, it is a little abnormal for battery temps to be that much hotter than everything else. It's ok that your batteries get 125-130 F, but it is odd that the caps are 80 and the lipos are 125-130.
                    www.keithbradleyboats.com

                    Comment

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