What are primary and secondary batteries ?

Explanation

Primary batteries : These batteries are for single use only. They must be discarded because they can not be recharged and reused. These batteries are also called non rechargeable batteries. This battery was first invented by Alessandro Volta in 1800. In these batteries the electrode reactions cannot be reserved by an external electric energy source. Eg. Dry cell, Mercury cell.
Secondary batteries : Secondary batteries, also known as rechargeable batteries, have electrochemical cells whose chemical reaction can be easily reversed by applying a certain amount of voltage in the opposite direction. Unlike the primary battery, the secondary battery can be recharged and used again. Typically, these batteries are used in high power consuming equipment . Some uses for secondary batteries include mobile phones, MP3 players, computers, telephone switches, watches, hearing aids, and Lead storage battery, Nickel cadmium storage cell.