What's the best battery to put inside a C2 restoration battery. - NCRS Discussion Boards

What's the best battery to put inside a C2 restoration battery.

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  • Richard B.
    Frequent User
    • May 31, 1984
    • 39

    What's the best battery to put inside a C2 restoration battery.

    Looking for recommendations to replace the small inner battery, in an older C2 restoration battery.
    If you have any experience or knowledge on this subject, please let me know.
  • James H.
    Frequent User
    • October 29, 2015
    • 75

    #2
    Richard
    One of our members did a tech session on that question. I will try to find and send to you. He took a 67 through the system.

    Comment

    • David H.
      Extremely Frequent Poster
      • June 30, 2001
      • 1559

      #3
      Originally posted by Richard Bonnell (7515)
      Looking for recommendations to replace the small inner battery, in an older C2 restoration battery.
      If you have any experience or knowledge on this subject, please let me know.
      Richard

      Not an answer to your question, but may be useful to others reading this thread.

      Something to consider with your restoration costs, taking advantage of modest point loss for a service replacement battery in Flight judging.

      Standard Deduction Guideline #2 Batteries, have a 25% Originality deduction for DELCO - correctly sized service replacement with appropriate top or side post configuration.

      For C2, with 25 Originality points, this would be a 5 point deduction (out of 4500 total points in Flight judging).

      On a "Dollars per Point" basis, there may be more fruitful places to spend your money.

      Dave
      Last edited by David H.; October 11, 2025, 07:50 AM.
      Judging Chairman Mid-Way USA (Kansas) Chapter

      Comment

      • David D.
        Frequent User
        • December 1, 1989
        • 77

        #4
        I used an Odyssey PC925L. It has worked well for two years now. Others have used a Braille brand battery.

        Comment

        • Robert P.
          Very Frequent User
          • October 19, 2019
          • 321

          #5
          could you share what you used to cut the case and where you made the cut
          thanks inadvance Bob

          Comment

          • David D.
            Frequent User
            • December 1, 1989
            • 77

            #6
            Originally posted by Robert Peckham (66450)
            could you share what you used to cut the case and where you made the cut
            thanks inadvance Bob

            Yes, I will attach the article I wrote regarding the internal battery replacement... Renewing a Restoration Battery.docx

            Comment

            • Jeffrey S.
              Extremely Frequent Poster
              • May 31, 1988
              • 1899

              #7
              David,
              What issue of the Restorer was this article in? I have cut open a Restoration Battery that was a lead acid cell battery and removed all the "guts". I would eventually like to do what you did and insert a new battery inside. What did you use for the cables to the posts on the donor case?
              Jeff

              Comment

              • Terry M.
                Beyond Control Poster
                • September 30, 1980
                • 15632

                #8
                Originally posted by Richard Bonnell (7515)
                Looking for recommendations to replace the small inner battery, in an older C2 restoration battery.
                If you have any experience or knowledge on this subject, please let me know.
                I don't have direct experience with this process, but I have owned a Corvette with a battery so equipped. For judging the recent battery deduction changes, as outlined by Dave H, should be considered.

                I would suggest you also consider the latest available battery that will fit in the space. Battery technology has and is changing rapidly and the latest available batteries that will fit and produce longer power, while quite expensive, are your best "bang for the buck" for longer term use. What was available five years ago may be exceeded now days.

                Be aware that some batteries, like AGM technology and Li technology, require special chargers to work their best. I am not sure at what point, if ever, Corvettes had charging systems geared to these types of batteries, so additional auxiliary charging systems will be helpful to produce a stronger charge and longer lasting battery. You will lose more points than you hope to gain if your battery fails during operations.

                Bottom line of my message is using a smaller battery with more power per volume my open a deep hole that requires much forethought to get the maximum power output per cubic volume.

                If you chose to dismantle the old battery yourself be sure to wear rubber gloves and eye protection. A rubber or plastic apron is a good idea also. Sulfuric acid or products soaked with it are in the battery regardless of how old it is. Be careful. And the proper disposal of the mess from the inside of the old battery is another matter.
                Terry

                Comment

                • Richard B.
                  Frequent User
                  • May 31, 1984
                  • 39

                  #9
                  Many thanks to all who replied with technical information and advice.
                  I appreciated your help.

                  Comment

                  • David D.
                    Frequent User
                    • December 1, 1989
                    • 77

                    #10
                    Originally posted by Jeffrey Salz (13182)
                    David,
                    What issue of the Restorer was this article in? I have cut open a Restoration Battery that was a lead acid cell battery and removed all the "guts". I would eventually like to do what you did and insert a new battery inside. What did you use for the cables to the posts on the donor case?
                    Jeff

                    Jeff -- my particular Restoration Battery already had a powersports-style AGM battery inside along with short cables connecting the AGM battery to the battery posts of the Restoration Battery top. I simply replaced the AGM battery with a similar new one.

                    Comment

                    • Jeffrey S.
                      Extremely Frequent Poster
                      • May 31, 1988
                      • 1899

                      #11
                      David,
                      Thanks for that. That is what I thought but wanted to confirm.
                      Jeff

                      Comment

                      • Tim G.
                        Extremely Frequent Poster
                        • March 1, 1990
                        • 1417

                        #12
                        I have replaced the internals on a Restoration Battery and cored an original R59 battery. The Odessey Battery is a good fit. Once you open up either type of battery, you have a case that will last forever. I just work from the bottom, remove the guts and replace the battery. I like a plexiglass bottom so you can see what is going on inside. Pool floaties work great to take up the slack. Restoration batteries have about a 2" base of epoxy to work around. Coring an acid filled battery is a pain due to all the internal plastic sections and the lead plates. It took me four hours of careful work not to damage the case. Here are photos of an original R59, not very pretty during the process because you are tearing apart something that was not designed to come apart.
                        Attached Files

                        Comment

                        • Tim G.
                          Extremely Frequent Poster
                          • March 1, 1990
                          • 1417

                          #13
                          Coring completed.
                          Attached Files

                          Comment

                          • Tim G.
                            Extremely Frequent Poster
                            • March 1, 1990
                            • 1417

                            #14
                            Battery installed.
                            Attached Files

                            Comment

                            • Tim G.
                              Extremely Frequent Poster
                              • March 1, 1990
                              • 1417

                              #15
                              Here is what you are dealing with when you remove the sealed battery from a Restoration battery. One side is snugged up to the side and it's very hard to get a saw in the space.
                              Attached Files

                              Comment

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