I thought the NC-3 NiCad Battery Pack was a cluster of NiCad cells similar to the older NC-2. It arrived today and is actually a slightly different regular NC-3. It's just a battery holder. There was another flash made with a different battery holder for NiCads. It was the Soligor MK-10A. The older NiCads had a smaller protrusion from the positive end. Just to complete things, I ordered some AA NiCads. They are rated at 2800 mAh so they may take longer to charge. I realize that the mAh ratings for these batteries are not always realistic. From what I remember, the Charge 15 and the later Charge 12/20 were only made to quickly Charge the NiCads for a limited number of shots. I go way back with NiCads. My first flash was a Honeywell Strobonar 100, which took 2 AAs. My father had an Acmelight 500, which came with four NiCad AAs and a charger. I took more pictures so I would charge the AAs overnight and use them, two at a time, in my Strobonar 100. Back then I think the AA NiCads had a capacity of only about 450 mAh. You didn't get that much out of them by charging them overnight but for a kid, it was nice not to have to keep buying disposable AAs. I also have more than one Quantum battery pack for my 283s and 285s. With the LVP-2 and a set of D batteries, I could shoot all day, even of the recycle time would not be as fast as with the Quantum packs.