I can get a red top dual post Optima for $119 locally but the guy mentioned he has a yellow top that was used by a guy for about 5 months and he needed something different so the battery guy took it as a trade. He said I could buy it for $50.00. I want the right battery for my truck but I have heard the yellow tops being used as regular starting batteries. This would go on my 69 K20 with a 454, maybe have electric fans at some point and hopefully a winch but that is years away. I would assume the used yellow top would be without warranty. Money is not the issue if the red is the one I should be using I will buy it, but the yellow is pretty cheap. What do you think?