Primary cell: The electrolyte in primary cell is chemically irreversible. That is once the cell is discharged it cannot be recharged. It should be replaced with a new cell. The cells can supply only low currents and have low efficiency. They supply intermittent current. Their internal resistance is more. These cells are comparatively cheap.
Secondary cell: These cells are chemically reversible. They can be discharged and charged. They can supply large currents because their internal resistance is less. These have high efficiency compare to primary cells. These can supply constant current. These are comparatively costly.
