Back when I was running every weekend with my Daytona (8.60's@150mph) and on my second 16 volt battery I made the switch back to a 12 volt Sears Platinum battery. The car ran exactly the same ET with both systems even without an alternator. Both set-ups were with one battery. In the Duster I use the same battery but since have added an alternator. The only benefit with the 16 volt system that I ever noticed was that the engine turned over faster. Now I get over 6 years out of my batteries before i use them for something else. The 16 volts were good for about 3 years and I couldn't use them in anything else that I owned.