Battery chemistry refers to the study of the chemical reactions that occur within batteries to store and release electrical energy. Different types of batteries, such as lithium-ion, nickel-cadmium, and lead-acid, utilize various chemical compounds and reactions to function. These reactions involve the movement of ions between the battery's anode and cathode, which generates an electric current. The performance and efficiency of a battery depend on its chemistry, including factors like energy density, charge cycles, and temperature stability. Advances in battery chemistry aim to improve energy storage solutions for applications in electric vehicles, renewable energy, and portable electronics, making them more efficient and environmentally friendly.