I'm currently running a single battery in my Dart. The load is pretty basic- MSD, fuel pump, water pump, fan, line-loc. I run a GM one-wire alternator, and still run short of power if I go rounds. Because it's 1/8 mile, cool downs are quick, so I'm not running the fan/water pump for more than a few minutes between rounds, yet I still ended up with a dead battery after 4 runs. I've tried bigger batteries, and RV/marine batteries, and nothing seems dramatically better than anything else. I've double checked the system to make sure the alternator is charging, and it is. It's not putting out big voltage, but it should be enough that the battery isn't draining out. I'm going to add a second battery. Do I connect them positive to positive and negative to negative? (Dumb question, but I've seen some battery banks connected positive-negative.)