Nickel cadmium battery
A 'nickel cadmium battery' is a secondary cell. It is also known as 'Nicad' or 'Ni-Cd'. It was used for many applications, such as rechargeable phones, flashlights, and other things. Now the nickel metal-hydride battery is being used. Nickel cadmium batteries contain toxic cadmium metal in them. Potassium hydroxide is used as an electrolyte.