Which of the following is not an advantage of a dry electric cell?

A dry electric cell is a commonly used portable electric cell that produces electricity from chemical reactions. 

• A dry cell is small in size, lightweight and easy to transport.
• Since the chemicals are properly stored inside the cell, there is no fear of leakage.
• However, since the electricity is produced from the chemicals inside the cell, the electric cell stops producing electricity when the chemicals inside it are used up. 
• Therefore, it can't last forever.