21.4Cells and Batteries

21.4    Cells and Batteries

Rechargable and non-rechargeable cells

  • Batteries are electrochemical cells used as portable sources of electricity
    • Primary cells cannot be recharged and are discarded once the supply of electric current decreases. This happens when the concentration of reactants becomes too low.
    • Secondary cells can be recharged over and over This involves converting the products back to the reactants produced when delivering the current by electric current.

Dry cells 


Lead-acid accumulator


Hydrogen-oxygen fuel cells













Electric cars