A nickel–metal hydride battery, abbreviated NiMH or Ni–MH, is a type of rechargeable battery. The chemical reaction at the positive electrode is similar to that of the nickel–cadmium cell (NiCd), with both using nickel oxide hydroxide (NiOOH). However, the negative electrodes use a hydrogen-absorbing alloy instead of cadmium. A NiMH battery can have two to three times the capacity of an equivalent size NiCd, and its energy density can approach that of a lithium-ion battery.
Features
Low volumetric energy density
High self-discharge
Low Self discharge (LSD)
Wide range with different specifications
Two to three times the capacity of an equivalent size nickel-cadmium battery
Application
Road studs
Medical applications
Emergency lighting, torch lights, LED lamps
Energy meters
Hand-held terminals, ticketing machines, POS Terminals