Secondary cells encompass rechargeable batteries that store electric energy at their electrode by reversible redox reactions. The type of electrolyte-based batteries ranges from nickel-cadmium, lead-acid, magnesium ion to lithium-ion batteries. Nickel-cadmium is among the oldest rechargeable battery that was popularly sold in the 1990s for domestic use. This antique battery pack used nickel hydroxide as the positive electrode whereas potassium and cadmium hydroxide was employed as the negative electrolyte and electrode respectively. Owing to their exceptional conductivity properties, nickel-cadmium batteries are able to charge and discharge rapidly. Additionally, these batteries are able to operate at low temperatures and have an energy density of approximately 50Wh/kg. The use of lithium-ion batteries is becoming widespread owing to their lightweight and high energy density of about 160W h/kg.