Battery Connections 2007 Sportsman Touring 500 4×4

Hello, I originally posted this in the New Member section but have not received any help. I am 75 years old, my 1st 4 wheeler.

I need some help in connecting my battery back up. I guess when you reach 75 years old you are allowed a few mistakes. When I removed my battery I failed to note my connections. I know I have a ground wire and a hot wire, plus one other wire that goes on the positive post. My problem is that I have 2 other wires, one black and one black w/white stripe joined together. Where do these two wires go, negative or positive?

My wife wants it out of her garage so any help would be appreciated.

Thanks Joe