[billybronco1]

So, lots of talk about jumping the 6v positive ground with a 12 volt, I get it. But what if you want to jump a 6v positive ground with a 6v battery? Can you just hook positive to positive and negative to negative, or do I need to disconnect the original battery? Reason I ask is when my car gets hot it does not want to start right up like when its cold. I have a red top Optima that is about six years old and I think its getting tired. I just as soon keep a fully charged six volt battery in the trunk rather then be dealing with 12v jumps.