I use an Optima yellow top too. But, although the others in LMS scoff at the idea, I have been contemplating a second battery as well. Maybe for different reasons. Now that I have the 16V I am fuel injected and cannot rely on a roll start to get me home, I need power for the injection system and fuel pump. I'm considering setting up a second battery that would run my computer and fuel pump via isolator in case of an emergency(such as a dead batt. or alt. in the middle of Zuwharre or Paragon). Does anyone else have such a set up? What is the general opinion on such an Idea?