You can use the charger's engine starting function to start up when coming across following problems: The car has no eletricity and breaks down. The engine oil becomes thicker in winter,which makes it difficult to start up. The car's engine is aging and it is unable to start up the car.This Car Battery Charger have 10-second car engine start function and temperature control fan, when MCU detect the charger’s temperature more than 45 degrees will open the fan until below to 35 degrees.Can choose charging current, 7A\14A\20A\40A.Also have auto stop when full recharge function. Three-phase constant current,constant voltage,floating(trickle)quick charge. 10-second car engine start function. High efficient power transfer technology. Compact and lightweight design. All kinds of working state digital display. Intelligent digital battery repair and active function. Various power circuit protection. Alumium magnesium shell,plane drawbench and metal anodic oxidation tecnology. Temperature control fan. LED display. Model DC-1210A Input voltage AC:220V 50Hz Input current 2.5A Maximum output current 10A±3A The battery type 12V /24V ,>24AH Working temperature - 10 Centigrade to 40 Centigrade Storage temperature - 20 Centigrade to 70 Centigrade and when the voltage of the battery is lower than the value set by the charger, the charger will work under the constant corent mode and supply constant corent for the battery.You can use the charger's engine starting function to start up when coming across following problems: The car has no eletricity and breaks down. The engine oil becomes thicker in winter,which makes it difficult to start up. The car's engine is aging and it is unable to start up the car.