Anyone interested in a graphene battery test?

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  • T.S.Davis
    Fast Electric Addict!
    • Oct 2009
    • 6220

    #91
    That's about how many a cut open and dropped in a salt bath this passed Saturday.
    Noisy person

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    • kfxguy
      Fast Electric Addict!
      • Oct 2013
      • 8746

      #92
      I went to slip a 4s in my Rivercat, no go. Ugh. So I narrowed the rails. Nope. So I took the shrink off to investigate, there's some thin protective plates on each side which adds 1mm thickness to the batteries. I removed them and now they fit (had to do a pair of them blah). I also had to rethink my hatch hold down rivnuts because the batts were right up against them....I flip and I could be in trouble! Drilled them out and epoxied in some t nuts. Guessing should have paid more attention to the specs before ordering huh! Well I'm gonna order some 4400's just for this boat because they are 2mm thinner so they should work better. I'm still planning on some testing this week. More than likely run it on 3s first and run the shocker on 8s.


      Last edited by kfxguy; 07-26-2016, 12:01 AM.
      32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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      • srislash
        Not there yet
        • Mar 2011
        • 7673

        #93
        Let the testing begin!!!

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        • kfxguy
          Fast Electric Addict!
          • Oct 2013
          • 8746

          #94
          Originally posted by srislash
          Let the testing begin!!!


          Yes sir! I'm trying to sort out how I'm doing this. I have no data logger on the shocker so that test would be purely a speed comparison and battery temp test. I plan on bringing the laptop with me to the lake so I can pull the logs from the Rivercat. I guess what I may do is run an aggressive prop on 3s and load it up to see how things fair. That's what I'm planning. Then if she goes faster on the 3s graphenes vs the hv cells on 3s....4s is going to be intimidating.


          Question. Should I charge the hv cells to full voltage or just compare everything at 4.20?
          32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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          • Darin Jordan
            Fast Electric Addict!
            • Apr 2007
            • 8335

            #95
            Originally posted by kfxguy
            Travis,

            The better quality cells usually have aluminum on the outsides, and even between the cells. Helps to draw heat out of the cells, and also protects the cells from damage.
            Darin E. Jordan - Renton, WA
            "Self-proclaimed skill-less leader in the hobby."

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            • kfxguy
              Fast Electric Addict!
              • Oct 2013
              • 8746

              #96
              Originally posted by Darin Jordan
              Travis,

              The better quality cells usually have aluminum on the outsides, and even between the cells. Helps to draw heat out of the cells, and also protects the cells from damage.
              Yea I've seen that on venom.....but I'm not so sure they are better/good quality lol
              32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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              • dmitry100
                Fast Electric Addict!
                • Mar 2015
                • 1264

                #97
                Do any of you guys heat up your lipo's before use?

                I read a bunch of stuff about how something around 45*C or so is lithium's "optimal" temperature in terms of performance... basically resulting in big jumps in overall discharge in amps overall.

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                • ray schrauwen
                  Fast Electric Addict!
                  • Apr 2007
                  • 9475

                  #98
                  Years back Steve Reesor ALWAYS heated his packs before a heat in a camping heater/cooler. Nobody, not even the best nitro guts could catch him and in many races he could also lap them in open hydro classes.

                  I miss him dearly.
                  Nortavlag Bulc

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                  • ray schrauwen
                    Fast Electric Addict!
                    • Apr 2007
                    • 9475

                    #99
                    ....and his Thunderpower packs came back cooler after a heat. Not sure how warm he got them first.

                    Experiment like he did.
                    Nortavlag Bulc

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                    • srislash
                      Not there yet
                      • Mar 2011
                      • 7673

                      #100
                      Originally posted by dmitry100
                      Do any of you guys heat up your lipo's before use?

                      I read a bunch of stuff about how something around 45*C or so is lithium's "optimal" temperature in terms of performance... basically resulting in big jumps in overall discharge in amps overall.
                      I've been warming my packs in the off season when doing speed runs. I have noticed a difference. But then this is Canada and ambient fall/winter temps are 0-5 celsius.

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                      • srislash
                        Not there yet
                        • Mar 2011
                        • 7673

                        #101
                        Originally posted by kfxguy

                        Question. Should I charge the hv cells to full voltage or just compare everything at 4.20?
                        I think everything at 4.20. I have noticed AMAZING power when fully charging HV's.
                        Y'know, I really haven't read anything stating that awesome results are to be expected from the graphenes. Just more stable product. Now how they 'push' that stability...

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                        • dmitry100
                          Fast Electric Addict!
                          • Mar 2015
                          • 1264

                          #102
                          srislash, Well even keith is mentioning lower voltage drop in high loads with GO packs... just much lower overall IR in comparison apparently.

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                          • T.S.Davis
                            Fast Electric Addict!
                            • Oct 2009
                            • 6220

                            #103
                            The GP HV cells have G10 plating. The Turnigy graphene have G10 plating. The GP graphene have G10 plating. They do hold up better. Less prone to mechanical damage. I have some boats where the cells are an absolute bugger to get in and out of the boat. The plating will help with that.

                            Ray, I miss Steve too. He's good people.
                            Noisy person

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                            • Doby
                              KANADA RULES!
                              • Apr 2007
                              • 7280

                              #104
                              Originally posted by T.S.Davis

                              Ray, I miss Steve too. He's good people.
                              Steve got me involved in racing..nice guy...my bank account would be much happier if it wasn't for him.
                              Grand River Marine Modellers
                              https://www.facebook.com/search/top/...ne%20modellers

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                              • T.S.Davis
                                Fast Electric Addict!
                                • Oct 2009
                                • 6220

                                #105
                                A lot of his gear is still racing.
                                Noisy person

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