Nickel-Metal Hydride (Ni-MH) battery is a kind of rechargeable battery with nominal voltage of 1.2V, which has three types: cylindrical, prismatic and button-type Ni-MH batteries are designed to meet the requirement for increasingly higher levels of energy demanded by today’s electronic products.


  • The negative electrode reaction occurring in a Ni-MH cell is H2O + M + e- → OH- + MH
  • The charge reaction is read left-to-right and the discharge reaction is read right-to-left. On the positive electrode, nickel oxyhydroxide (NiOOH) is formed. Ni(OH)2 + OH- → NiO(OH) + H2O + e-

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