Design And Function: Principle
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2013 Volvo C70, 2012 Volvo C70, 2011 Volvo C70, 2010 Volvo C70, and 2009 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
A battery is a unit which stores chemical energy which can then be converted into electrical energy as required. When the battery is connected to an external source of consumption (the car starter motor for example), the stored chemical energy is converted into electrical energy and current flows through the circuit.
The start battery in a car, the lead accumulator, is rechargeable. Such a battery can be recharged repeatedly, whereby electrical energy is converted to chemical energy.