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Views: 0 Author: Site Editor Publish Time: 2025-09-27 Origin: Site
Environmental Regulations
Ni-Cd batteries contain toxic heavy metal cadmium, which poses serious risks to the environment and human health.
With the implementation of strict regulations in regions such as the EU and Japan, Ni-Cd batteries were gradually phased out.
Higher Energy Density
Ni-MH batteries offer about twice the capacity of Ni-Cd batteries for the same volume or weight.
This made them more suitable for devices requiring longer runtime, such as digital cameras, portable music players, and toys.
Reduced Memory Effect
Ni-Cd batteries suffer from a severe memory effect, requiring full discharge before recharging to avoid capacity loss.
Ni-MH batteries have a much lighter memory effect, improving convenience and user experience.
Wider Applications
Ni-MH batteries quickly expanded from household electronics to portable devices and even hybrid electric vehicles.
For example, Toyota Prius widely adopted Ni-MH batteries, which further boosted their industrial development.
Decreasing Cost
Initially, Ni-MH production was more expensive. But with technological progress and large-scale manufacturing, costs dropped significantly, narrowing the gap with Ni-Cd.
Transition Role
While Ni-MH itself was later replaced by lithium-ion batteries, it played an important transitional role between Ni-Cd and Li-ion in the 1990s–2010s.
Conclusion:
Ni-MH batteries replaced Ni-Cd batteries mainly due to environmental regulations, higher energy density, weaker memory effect, and growing market demand, making Ni-MH the natural successor to Ni-Cd.
