Nickel-Cadmium (NiCd) batteries are a type of rechargeable battery that use nickel oxide hydroxide and cadmium as their electrodes. They are known for their ability to deliver high discharge rates and perform well in extreme temperatures. NiCd batteries are commonly used in portable power tools, emergency lighting, and some consumer electronics. One of the main advantages of NiCd batteries is their durability and long cycle life, allowing them to be recharged many times. However, they have a memory effect, which can reduce their capacity if not fully discharged before recharging. Additionally, the use of cadmium raises environmental concerns due to its toxicity.