Both NiMH and NiCd batteries are suitable for applications with relatively high power consumption. However, there are several important differences between the two technologies.
NiCd batteries are known for their robustness and are often used in power tools such as drills. They perform well under demanding conditions and at low temperatures.
A major disadvantage of NiCd batteries is that they contain cadmium, a toxic and environmentally harmful heavy metal. Because of environmental regulations, the use of NiCd batteries in many portable applications has been restricted, and they are increasingly being replaced by NiMH batteries.
NiMH batteries offer a higher energy density and larger capacity, allowing devices to operate longer on a single charge. They are commonly used in portable electronics such as laptops, flashlights, and consumer devices.
Advantages of NiMH batteries include:
One limitation of NiMH batteries is that they are generally less resistant to extreme heat and cold. For optimal lifespan and performance, NiMH batteries should preferably be stored at cool ambient temperatures between 1 °C and 25 °C.