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A nickel–metal hydride battery, abbreviated NiMH or Ni-MH, is a type of rechargeable battery. It is very similar to the nickel–cadmium cell (NiCad). NiMH use positive electrodes of nickel oxyhydroxide (NiOOH), like the NiCad, but the negative electrodes use a hydrogen-absorbing alloy instead of cadmium, being in essence a practical application of nickel–hydrogen battery chemistry. A NiMH battery can have two to three times the capacity of an equivalent size NiCad, and their energy density approaches that of a lithium-ion cell.