Nickel-Metal Hydride Battery


A Nickel-Metal Hydride battery, often abbreviated as NiMH, is a type of rechargeable battery that uses a metallic alloy and a hydrogen-absorbing alloy for its electrodes. Its specific energy and energy density are significantly higher than those of a nickel-cadmium battery, resulting in longer lifespan and higher capacity. It is widely used in consumer electronics, electric vehicles, and hybrid cars.


The phonetics for “Nickel-Metal Hydride Battery” would be “nik-ul-met-ul high-drid bat-uh-ree”.

Key Takeaways

  1. Environmentally Friendly: Nickel-Metal Hydride Batteries are less harmful to the environment than many other battery types. There are no toxic metals (like lead or cadmium) in NiMH batteries, hence are considered more environmentally friendly.
  2. High Energy Density: Nickel-Metal Hydride Batteries have a high energy density, meaning they can store a large amount of energy in a relatively small amount of space. This makes them ideal for devices where long run times are crucial, such as laptops and electric vehicles.
  3. Memory Effect: NiMH batteries are less prone to the “memory effect” compared to older nickel-cadmium batteries, allowing them to be recharged at any time without losing their maximum energy capacity. However, they still need to be fully discharged every so often (approximately every 30 charges) to maintain their performance and lifespan.


The technology term ‘Nickel-Metal Hydride Battery’ (NiMH) is important because it refers to a type of rechargeable battery that’s significantly influential in numerous industries. NiMH batteries possess a high energy density, meaning they can store substantial amounts of energy in a relatively small space. This makes them ideal for use in a variety of devices, such as portable electronics (e.g. laptops, cameras), hybrid cars, and electric vehicles. They’re also more environmentally friendly than other batteries, like the Nickel-Cadmium batteries, as they don’t contain harmful heavy metals. With these advantageous qualities, NiMH batteries play a major role in the advancement of modern technology and sustainable energy solutions.


The Nickel-Metal Hydride Battery, often abbreviated as NiMH, is a rechargeable battery that has been widely used in a variety of applications due to its superior energy density than several other rechargeable battery types. The NiMH battery is designed to power high-drain devices like digital cameras, flashlights, electric tools, toys, and personal digital assistants. As a result, this technology offers an outstanding performance in powering both portable and stationary devices.In addition to portable consumer electronics, NiMH batteries serve an essential role in the automotive industry. They are used in hybrid electric vehicles (HEVs) as they provide the required energy for the electric motor, enhancing fuel efficiency and reducing carbon emissions. A well-known example of this is Toyota Prius, which employs NiMH battery technology. Besides, NiMH batteries are often used in lower-power applications like cordless phones and medical equipment due to their high reliability and longer lifespan relative to other battery types. Their versatility and reliability clearly underline their importance in various fields.


1. Electric Vehicles: The Toyota Prius is one of the most popular hybrid cars that use nickel-metal hydride batteries. This technology provides the electrical energy necessary to power the vehicle, alternating with the conventional combustion engine to achieve better fuel economy and reduce emissions.2. Power Tools: Many cordless power tools, such as drills, saws, or lawn care equipment, use NiMH batteries due to their high-power capacity and rechargeability. These batteries make them portable and more effective to use.3. Rechargeable Consumer Electronics: Everyday devices such as digital cameras, laptops, camcorders, and handheld game devices often utilize nickel-metal hydride batteries. They provide long-lasting power and can be recharged hundreds of times, which makes them cost-effective and environmentally friendly.

Frequently Asked Questions(FAQ)

**Q1: What is a Nickel-Metal Hydride (Ni-MH) Battery?**A1: A Nickel-Metal Hydride battery is a type of rechargeable battery that uses a nickel-based positive electrode and a hydrogen-absorbing metal alloy for its negative electrode. This type of battery was developed to provide a safer and more environmentally friendly alternative to Nickel-Cadmium batteries.**Q2: What are the advantages of Ni-MH batteries?**A2: Ni-MH batteries offer several advantages including: high energy density, relatively long life span, lower cost compared to Lithium-ion batteries, and being safer and more environmentally friendly than Nickel-Cadmium batteries.**Q3: What are the disadvantages of Ni-MH batteries?**A3: Despite their advantages, Ni-MH batteries also have downsides such as a higher level of self-discharge meaning they lose their charge quicker when not in use compared to other rechargeable batteries. They are also heavier than Lithium-ion batteries and have a lower energy density in comparison.**Q4: What are Ni-MH batteries commonly used in?**A4: Ni-MH batteries are commonly used in hybrid cars, portable electronics like digital cameras, flashlights, and certain models of cordless phones, laptops, and power tools.**Q5: How do I properly maintain a Ni-MH battery?**A5: To maintain a Ni-MH battery, it’s generally recommended to fully discharge and recharge the battery periodically, as it can suffer from “memory effect” which reduces its capacity. Also, it’s best to store it in a cool place and avoid exposing it to high temperatures.**Q6: What is the life expectancy of a Ni-MH battery?**A6: The life expectancy of a Ni-MH battery usually varies depending on its use and maintenance, but typically they can last for hundreds to a thousand recharge cycles.**Q7: Are Ni-MH batteries rechargeable?**A7: Yes, Nickel-Metal Hydride Batteries are rechargeable. They can be charged using a standard battery charger or any device designed to charge Ni-MH batteries.**Q8: Are Ni-MH batteries environmental friendly?**A8: Yes, Ni-MH batteries are considered more environmentally friendly than other types of batteries, especially compared to Nickel-Cadmium batteries. They do not contain toxic heavy metals and are easier to recycle.

Related Tech Terms

  • Rechargeable Battery
  • Energy Storage
  • Power Density
  • Self-discharge Rate
  • NiMH Chemistry

Sources for More Information


About The Authors

The DevX Technology Glossary is reviewed by technology experts and writers from our community. Terms and definitions continue to go under updates to stay relevant and up-to-date. These experts help us maintain the almost 10,000+ technology terms on DevX. Our reviewers have a strong technical background in software development, engineering, and startup businesses. They are experts with real-world experience working in the tech industry and academia.

See our full expert review panel.

These experts include:


About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

More Technology Terms

Technology Glossary

Table of Contents