Battery Problems

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • obrien
    Fast Electric Addict!
    • Nov 2007
    • 1264

    #1

    Battery Problems

    I am not sure what has happened yet, so I am looking for some help here.
    My first battery back yesterday was a pair of venom 3000s. I had just finished making a few passes, brought it in, set it on the stand, and as I was opening the hatch, boom one of the battery packs blew up. Well I cleaned all of that out, let it cool down for a bit, and put in my set of tenergy 7 cell 4200s. I ran that around for about 3 or 4 minutes and then it died. Once back in, I looked everything over, it all seemed fine, so I put in the trinity 4200 6 cell packs after letting it sit for a few minutes. I turned it all back on, every thing worked fine.

    Well tonight I see that a wire came off of one of the cells in my tenergy pack, and one of my trinity batteries appears to have become really hot. Then end cap is slghtly melted.

    The boat has a hydra 120 esc, ammo 36-50-2300kv, and I was running an octura x642, and switched to the stock prop on the very last run. The trinity's were run on both batteries.

    Any help would be great. I am going to start with resoldering my battery connections since they are not that great. I am a newb at this so I need more practice.
  • Avanti
    Fast Electric Addict!
    • Nov 2007
    • 1280

    #2
    as long as you are redoing them turn them to side by side wit bars
    The Manx has been sitting dormant, but I think I finally have my motivation back. I hope to see it float soon.

    Comment

    • obrien
      Fast Electric Addict!
      • Nov 2007
      • 1264

      #3
      yeah I think I just need to do all of my packs. I just concerns me that I am having problems with everything. I have some other props to try and see what happens. I should have my data logger soon. Then I can see what exactly is happening.

      Comment

      • ReddyWatts
        Fast Electric Addict!
        • Apr 2007
        • 1711

        #4
        I would not use the Tenergy NiMH battery packs in a setup that uses more than 50 amps.
        ReddyWatts fleet photo
        M1 Supercat - Neu 1527 1Y, 8s / Mean Machine- Feigao 580, 8s, 120 HV esc
        Mean Machine - Feigao 540 14XL, 8s, 100 amp HV esc, X537/3

        Comment

        • Avanti
          Fast Electric Addict!
          • Nov 2007
          • 1280

          #5
          readywatts can you elaborate on that. obrien and I are both fairly green when it comes to amps used and brushless motor requirements. when we were into rc back in the day, there was none of this to worry about so we are in a learning process with all the new stuff.
          The Manx has been sitting dormant, but I think I finally have my motivation back. I hope to see it float soon.

          Comment

          • obrien
            Fast Electric Addict!
            • Nov 2007
            • 1264

            #6
            is it the cells we have to worry about, or connections?

            Comment

            • ReddyWatts
              Fast Electric Addict!
              • Apr 2007
              • 1711

              #7
              The Tenergy packs use very thin connecting tabs. They will get hot enough to melt the solder on the wire connections and your battery temps will get very hot. The cells have a higher resistance and you will not get as much speed out of them as an IB3600 cell. Buy cells with the heavier connection bars if running over 50 amps. The Tenergy cells are not as durable or designed for the higher current. Most brushless Fiegao motors will use from 50 to 100 amps depending on the windings and prop.

              I have some 3300 tenergy cells that have lasted for a long time but I am now only running them on 700sc motors. 35 to 40 amps.
              Last edited by ReddyWatts; 12-04-2007, 01:27 PM.
              ReddyWatts fleet photo
              M1 Supercat - Neu 1527 1Y, 8s / Mean Machine- Feigao 580, 8s, 120 HV esc
              Mean Machine - Feigao 540 14XL, 8s, 100 amp HV esc, X537/3

              Comment

              • obrien
                Fast Electric Addict!
                • Nov 2007
                • 1264

                #8
                I will just plan to rebuild all of my battery packs and make sure they are right.

                Comment

                • domwilson
                  Moderator
                  • Apr 2007
                  • 4408

                  #9
                  I had problems with the Tenergy packs as well. They got hot and wouldn't deliver enough current. Went to battery bars and they seem to hold up that way. They don't get hot anymore. When I disassembled the packs, the tabs were very thin and easy to remove. They are just tacked on with 4 small points of contact. If they get wet, it rusts and increased resistance. At least in my case, I didn't even see the rust until I pulled them apart.
                  Government Moto:
                  "Why fix it? Blame someone else for breaking it."

                  Comment

                  • obrien
                    Fast Electric Addict!
                    • Nov 2007
                    • 1264

                    #10
                    that might be what the problem is with my trinity batteries since they were in the boat when it went over a couple of weeks ago.

                    I quess I just have some soldering to do. lol

                    Comment

                    • sjslhill
                      Fast Electric Addict!
                      • Apr 2007
                      • 1513

                      #11
                      Be sure to use a volt meter to check each cell....in today's world, NIMH cells can just go to zero volts at anythime. I have 5, 4500mah cells that were charged up two weeks ago and now read 0 volts
                      Last edited by sjslhill; 12-04-2007, 01:25 PM. Reason: spelling

                      Comment

                      • obrien
                        Fast Electric Addict!
                        • Nov 2007
                        • 1264

                        #12
                        I will be sure to check that when I get to rebuilding the packs.

                        Comment

                        Working...