Kwik Start vehicles anywhere without AC power. Now accommodates a group 31 battery. On-board starter battery gives more cranking power than any fast charger, up to 1100 amps cold cranking power. Will accommodate a group 31 Max user supplied battery (L 13" X W 7" X H 9.5"). Smart choice for car dealers, airports, industrial plants and shopping centers to assist customers and employees where there is no electrical power.