Primary Batteries: Primary Batteries are those batteries which cannot be charge again. It can be used only once because the chemical reaction that supply the current are irreversible.
On the other side, secondary batteries are those batteries which can be used or recharged again and again. The process of secondary battery is reversible.
- A primary cell cannot be recharged whereas a secondary cell can be recharged.
- In a primary cell chemical reaction is irreversible whereas in a secondary cell chemical reaction is reversible.
- The internal resistance is high for a primary cell whereas it is low for a secondary cell.