Some of the questions on the original thread revolved around battery choice. The batteries I chose were close to the originals in diameter and slightly shorter. They are a Sub C size battery but if you research them you will find that they may vary a mm or 2 here or there. It doesn't seem like much but you are not working with a lot of space to begin with. As for capacity, my feeling is discharge capability would be my primary interest but that information is not readily available. Your instinct my be to go for a high capacity battery but my research says that many of those high capacity batteries do not live up to the claims under actual use.
I was able to use these packs in Bimini last month and I was doing 300+ photos on TTL mode on a single charge. So they meet the stated capacity of new Ikelite batteries. For Clarification I was using DS125 strobes.