Buy yourself one of those Quick Jump battery pack. Costco had some for $50... which was a real bargain... and keep with you when you know you got battery problem... quick jump and you are on your way. Worth every penny. I can't tell you how many time I have used it already...
My diesel MB had a real bad battery... I used it to jump my car all day... like 4 times... good enough for me! Of course, I changed the battery soon afterward... otherwise without it, I would have gotten stuck at shopping mall after that first jump... What is the other three jumps for? LOL I went shopping... LOL.