The 16 volt Rock battery is head and shoulders above the rest.
My Big block Mopar engine turns like the X brand cranking.
I had the 16 volt Turbo start battery and charger and the Tubro start charger stills charges the 16 volt Rock battery. The Rock makes the Turbo seem like a 6 volt battery. The 16 volt Turbo start battery(I know it was a better battery)did not seem to turn my engine any faster than the 8 year old Die Hard Marine battery.
I do not sell Rock or any other batteries,just trying to help out my fellow Mopar racers