If you decide to stay with MSD or Mallory, I highly recommend that you go to an Optima Yellowtop battery. I, also, don't run an alternator, have electic water pump and fans, which I run between rounds to cool down fast, even a bottle heater, and can run four passes with no problem between charges. Awesome battery. Regenerates itself. I have thought of going to two of them, think I could run all day without a charge.