What Is the Difference Between Ni-Cd and NiMH?

November 06, 2019 2 min read

The main differences between NiCAD and NiMH batteries deal with capacity, memory effect, and environmental friendliness.

1.Nickel-metal hydride (NIMH) batteries have a higher capacity than nickel-cadmium (NICAD) batteries, which means that they can generally power your device for longer. 
2.They also don't suffer from the same memory effect, so they won t forget the ability to achieve a full charge over time. 
3.Finally, NiMH batteries are much better for the environment than their NiCAD battery counterparts.
4.However, nickel-cadmium still offers some advantages over nickel-metal hydride, such as their extreme temperature performance.
Nickel-Cadmium (NiCAD) Batteries
The world's very first NiCad battery was developed by a Swedish researcher in 1899. Needless to say, there have actually been numerous renovations ever since.

A conventional nickel-cadmium battery is made up of a nickel(III) oxide-hydroxide favorable electrode plate, a cadmium unfavorable electrode plate, a separator, and a potassium hydroxide electrolyte.

Typical uses: Some prominent applications of NiCAD batteries are toys, emergency lights, medical equipment, commercial and industrial products, electrical razors, walkie-talkies, power devices, as well as much more.
NICAD BATTERIES
Benefits: Here’s an overview of some of the advantages of NiCAD batteries:
  1. Relatively inexpensive
  2. Charge very quickly, simple to charge
  3. Easy to store, easy to ship
  4. Take a high number of charges
  5. Functional in low temperatures
Drawbacks: And here are some of their shortcomings:
  1. Not as powerful as some other rechargeable batteries
  2. Self-discharge while in storage
  3. Contain toxic metals that are harmful to the environment
Nickel-Metal Hydride (NiMH) Batteries
NiMH batteries are a lot more modern-day phenomenon. R & d began at the Battelle-Geneva Proving Ground in 1967, and also was adequately finished in 1987.
The chemical structure of a conventional nickel-metal hydride battery looks like this: a nickel hydroxide positive electrode plate, a hydrogen ion adverse electrode plate, a separator, and an alkaline electrolyte such as potassium hydroxide.
Usual uses: These include automobile batteries, medical instruments, pagers, mobile phone, cameras, electronic video cameras, electrical toothbrushes, and also other low-cost consumer tools.
NIMH BATTERIES
Benefits: Here’s a look at a few of the advantages of going with a NIMH battery:
  1. Quite a high capacity compared to other rechargeable batteries
  2. Resists both over-charging and over-discharging
  3. Extremely lightweight construction
  4. Friendly to the environment: no hazardous chemicals like cadmium, mercury, or lead
Drawbacks: And here are some of the limitations:
  1. More expensive than other rechargeable models
  2. Self-discharge rapidly while in storage difference Between NiCad and NiMH
  3. Cut power suddenly rather than a slow trickle down
  4. Some only work with the manufacturer’s charger


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