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"Batteries" are compact power sources designed to store and supply electrical energy to various devices, including electronics, computers, computer implants, radio equipment, and other portable gadgets. They come in different shapes, sizes, and chemistries, each with unique characteristics that make them suitable for specific applications. For instance, some batteries are optimized for high energy density, providing long-lasting power to devices such as laptops and smartphones, while others prioritize high power density, enabling quick energy release required by devices like digital cameras and flashlights. Batteries operate based on the principle of electrochemical reactions between two electrodes - an anode and a cathode - immersed in an electrolyte solution. These reactions generate an electrical potential difference that drives the flow of electric current when a load is connected to the battery. As the battery discharges, chemical reactions occur, converting stored chemical energy into electrical energy. The capacity of a battery refers to the amount of charge it can deliver before it needs recharging or replacement. In summary, "Batteries" are portable and versatile power sources that enable the operation of various electronic devices by storing and supplying electrical energy through electrochemical reactions.