The term LI-ION COUSIN refers to the Nickel Cadmium (NICAD) battery, which is a type of rechargeable battery that uses nickel oxide hydroxide and cadmium as its electrodes. It was developed in 1899 and is commonly used in consumer electronics such as digital cameras, cordless power tools, and laptop computers. NICAD batteries are known for their high energy density and long life, but they are also prone to memory effect, which reduces their capacity over time.