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Ni-MH Batteries (Nickel-Metal Hydride)

Energy and Environment Ideas. Closeup of Bundle of Soldered Ni-Mh Rechargeable Batteries Placed Together Over Beige

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Nickel Metal Hydride (Ni-MH) is a type of rechargeable battery chemistry that has been widely used in various electronic devices since the 1990s.

Ni-MH batteries are an improvement over older nickel-cadmium (Ni-Cd) batteries and offer several advantages, including higher energy density and fewer environmental concerns.


Features and characteristics of nickel metal hydride batteries:

  • Chemistry: Ni-MH batteries use a combination of nickel oxyhydroxide (NiOOH) as the positive electrode (cathode) and a metal hydride compound (usually a rare-earth metal alloy) as the negative electrode (anode).
  • Rechargeability: Like other rechargeable batteries, Ni-MH batteries can be recharged hundreds to thousands of times, depending on the specific battery and its usage conditions.
  • Energy Density: Ni-MH batteries typically have a higher energy density compared to Ni-Cd batteries, meaning they can store more energy in the same volume or weight. This makes them suitable for use in high-drain devices like digital cameras, cordless phones, and portable electronics.
  • Memory Effect: Ni-MH batteries are less prone to the "memory effect" than Ni-Cd batteries, which means they do not need to be fully discharged before recharging to maintain their capacity. However, occasional deep discharge cycles can help optimize their performance.
  • Environmental Impact: Ni-MH batteries are considered more environmentally friendly than Ni-Cd batteries because they do not contain toxic cadmium. They are also less harmful to the environment when disposed of properly.
  • Self-Discharge: Ni-MH batteries have a higher self-discharge rate compared to some other rechargeable batteries, which means they lose their charge over time even when not in use. However, advancements in battery technology have reduced this issue in modern Ni-MH batteries.