I can't see how a Dynatron could have trouble turning over an .80. I run my Sullivan Dynatron with a 275 amp garden tractor battery, $20.78 at NAPA, it turns my older high compression Saito 150 and Laser 180 V-twin over like they were 25's. The battery will start engines, supply glow power and run my ACE Super Smart Charger for entire weekend. I have thought about running a cord from my cigarette lighter socket to charge the batt. on trips but have found not it unnecessary.