I'm sure this question has been asked numerous times on this forum. I did search the forum and couldn't find an answer. I'm installing a 2nd battery to 02 ssv. I already have a generic auto zone deep cycle as the starting battery. I'd like to purchase an optima blue top but I've read somewhere you shouldn't install a 2nd battery with a different chemistry? Does this mean I should buy 2 new batteries? Is 2 gauge wire sufficient? Thanks for any help.