Battery Power refers to the energy stored in a battery that can be used to perform work. It is typically measured in units such as Ampere-hours (Ah) or Watt-hours (Wh). The amount of electricity available from a battery depends on its capacity, which is determined by the type and size of the battery, as well as its state of charge. Battery power can be used to run devices that require electrical energy, such as smartphones, laptops or portable electronic devices.