A nickel metal hydride rechargeable battery is another kind of rechargeable battery that can substitute nickel cadmium batteries. It is dissimilar from nickel cadmium batteries which makes use of cadmium for its negative electrode, since it uses a hydrogen-absorbing alloy instead. However though, these two kinds of rechargeable batteries both utilize nickel oxyhydroxide for its positive electrode. A nickel metal hydride rechargeable battery can be more useful in some situations over nickel cadmium as well as other types of batteries and here are several of the reasons why.
First of all, a nickel metal hydride rechargeable battery has a higher energy density which is about 50% more than a nickel cadmium rechargeable battery. This entails that this kind of battery has the ability to store a larger amount of energy using the same volume of battery cell.
The second benefit of nickel metal hydride rechargeable battery is that is has a low rate of internal impedance. The internal impedance or resistance pertains to the ability of a battery to carry current. A little internal impedance is a good trait of a battery as it signifies that it permits high currents so that more energy can be transmitted to the device at a faster pace. However, the internal impedance of a nickel cadmium batter is still less than that of a nickel metal hydride rechargeable battery.
One more benefit of a nickel metal hydride rechargeable battery is that it is a very durable battery. This battery can endure overcharge and overdischarge conditions. In addition, this battery can also work in various temperature conditions. This makes them a truly multipurpose and convenient batteries.
One of the main weaknesses of a nickel metal hydride rechargeable battery is that it has a very high self-discharge rate which gives it a shorter life span. However, there are now low self-discharge nickel metal hydride rechargeable battery that resolves this issue.
Lastly, a nickel metal hydride rechargeable battery is more environmental friendly than other battery types since it does not have the toxic metals like cadmium. This is significant during those instances when the battery is thrown improperly because it will not cause harm to the environment. Furthermore, this rechargeable battery can be financially-rewarding when recycled, which may promote this particular behavior among people.
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