Nickel–metal hydride battery

<p>A nickel–metal hydride battery (NiMH or Ni–MH) is a type of <a href="/facts/Rechargeable_battery/A6zUkPkW">rechargeable battery</a>. The chemical reaction at the positive electrode is similar to that of the <a href="/facts/Nickel%E2%80%93cadmium_battery/JTbx4bcB">nickel–cadmium cell</a> (NiCd), with both  using  <a href="/facts/Nickel_oxide_hydroxide/aNHM0mEP">nickel oxide hydroxide</a> (NiOOH). However, the negative electrodes use a hydrogen-absorbing <a href="/facts/Alloy/I7w7WQWR">alloy</a> instead of <a href="/facts/Cadmium/wXkV2eIX">cadmium</a>. NiMH batteries can have two to three times the capacity of NiCd batteries of the same size, with significantly higher <a href="/facts/Energy_density/mwBXA7bC">energy density</a>, although only about half that of <a href="/facts/Lithium-ion_battery/3L22xFhB">lithium-ion batteries</a>.
</p><p>They are typically used as a substitute for similarly shaped non-rechargeable <a href="/facts/Alkaline_battery/gL5XUWo4">alkaline batteries</a>, as they feature a slightly lower but generally compatible cell voltage and are less prone to <a href="/facts/Battery_leakage/JTYULFhf">leaking</a>.
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Nickel–metal hydride battery open-in-new

Nickel–metal hydride battery