Hey Walmart I know................

It already has one in it---same battery actually. I don't even remember where that one came from, it was either in the truck or one of the junkers I got rid of. In other words it has two
Cool, your not worried this will shorten the life span of the new battery?
I was always told you shouldn't mix new and old batteries (but at today's cost, I can totally see why you would)

I wonder what makes your truck start so well I'm winter?

My plow truck is a 6.0 diesel and a real pain to start when it's cold, or sits for a few days