A battery is a device that stores chemical energy and converts it into electrical energy to power electronic devices, vehicles, and machines.
Inside a battery, chemical reactions occur between the anode (negative terminal), cathode (positive terminal), and electrolyte, producing a flow of electrons that creates electricity.
Primary Batteries – single-use (e.g., alkaline, coin cells).
Secondary Batteries – rechargeable (e.g., lithium-ion, lead-acid, NiMH).