A Nickel-Cadmium battery, often abbreviated as NiCd, is a type of rechargeable battery that uses nickel oxide hydroxide and cadmium as its electrodes. Known for their durability and ability to deliver high discharge rates, these batteries are commonly used in portable power tools, cameras, and emergency lighting systems. One of the key features of NiCd batteries is their ability to withstand deep discharges without significant damage. However, they suffer from a phenomenon called "memory effect," which can reduce their capacity if not fully discharged before recharging. Despite this, they remain popular in specific applications due to their reliability.