The primary cells make use of a chemical process which is not reversible. The cells have to be replaced after giving active service, e.g dry cells have to be discarded when discharged. The secondary cells on the other hand work on a reversible electro – chemical process, i.e. the cells have to be electrically charged before putting into service. These are discharged during active service i.e. while supplying current for a circuit. When completely discharged, the cells can be recharged by feeding electrical energy into the device. The other major advantage is the capacity of supplying electrical energy. Which is higher in the case of secondary cells. In other words a secondary cell can
supply more current for a long period as compared to a primary cell and can be recharged again and again
Also read
Working Principle of Lead acid Cell
