Nickel Cadmium Battery, also known as Ni-Cd Battery, is a type of rechargeable battery that uses nickel oxide hydroxide and metallic cadmium as electrodes. The electrolyte used in the battery is potassium hydroxide, which is typically in the form of a gel. Nickel Cadmium batteries are known for their ability to deliver high currents and maintain a stable voltage output, even under heavy loads. They are also known for their long cycle life and ability to perform well in extreme temperatures. Nickel Cadmium batteries were once widely used in consumer electronics such as cameras and portable music players, but they have been largely replaced by other types of batteries such as lithium-ion batteries. However, Ni-Cd batteries are still used in many industrial applications such as emergency lighting systems, standby power supplies, and aircraft batteries due to their robustness and long cycle life. One disadvantage of nickel cadmium batteries is that they contain toxic heavy metals, such as cadmium, which can be harmful to the environment and require proper disposal.