and I am not stepping on your toes by anymeans.... I am going a bit much on my system but, I am not buying an optima battery... I am using just the standard car battery thats in it, and the stinger battery as my secondary I got for nother out of a system I dismantled for a kid (he didn't even know they were in there, two of em)... I also don't have a cap anymore cuz I sold it. Since I had the equipment (the fosgate regulator and two stinger dry cells) I thought why not use it... little much but, rather be safe than to hurt anything on the car....