Your car battery is a rechargeable source of electrical energy. It supplies power to all the electrical components in your car and is charged by the alternator while the car is running. Sometimes known as the SLI (Starting, Lights, Ignition), the battery’s primary role is to provide the energy needed for those three essential functions. Battery life varies, but a rule of thumb is around three to five years. However, this depends on usage, maintenance and climate. Making lots of short journeys in your car will reduce battery life as it can only be fully recharged during long runs. Hot weather also weakens the battery. It pays to have a heavy duty battery, such as the 096. This offers plenty of capacity and cranking capability, which makes a huge difference – especially when starting on a cold morning.