CarBatteryWorld - If you follow the gauge on the car battery charger you will be able to understand how long you need to keep it connected to the car battery. Now, the negative end should be attached to the negative terminal of the working car battery and the other end to a metallic part of your car engine. Solar chargers for automotive batteries have solar panels installed in its face. Corrosion is a main problem for batteries and can make them die before their time. In a traditional gasoline or diesel car engine, the battery can run out just by forgetting to turn of the headlights or even the reading lamps for very long! The trick is to recognise the tell tale signs of a failing battery and change it before it fails completely and leaves you stranded miles from home, late at night in the cold. Radios and simple cassette players are now replaced by iPods and DVD players.