Rechargeable batteries with a nominal voltage of 1.2 volts have become an increasingly popular choice for powering electronic devices due to their cost-effectiveness and environmental sustainability. Among the different types of rechargeable batteries available, NiMH (Nickel-Metal Hydride) and NiCd (Nickel-Cadmium) batteries are commonly used in various applications.

NiMH and NiCd batteries offer similar benefits, including a high-capacity power source, long battery life, and the ability to be recharged hundreds of times. However, it's important to note that both types of batteries have a nominal voltage of 1.2 volts, which is lower than the 1.5 volts of disposable Alkaline batteries.

NiMH batteries are an improvement over NiCd batteries and are becoming increasingly popular due to their higher capacity and lower environmental impact. They are a great choice for applications that require a lot of power and long battery life.

NiMH batteries have a higher capacity than NiCd batteries, meaning they can hold more energy and provide longer run times. They also have a lower self-discharge rate, which means they can hold their charge for longer periods of time when not in use. Additionally, NiMH batteries do not suffer from the memory effect that can affect NiCd batteries. This means that NiMH batteries can be recharged at any time without the need to fully discharge them first.

Another advantage of NiMH batteries is that they are less toxic than NiCd batteries and are more environmentally friendly. They are also available in a variety of sizes, including AA, AAA, C, D, 2/3 A, 2/3 AA, sub-C, and A, making them suitable for use in a wide range of electronic devices.

NiCd batteries were once the most commonly used rechargeable batteries due to their reliability and long lifespan. They are still used in some applications today, particularly in devices that require a lot of power and fast charging times.

One advantage of NiCd batteries is that they have a faster charging time than NiMH batteries, making them a good choice for applications where a quick recharge is necessary. They also have a longer lifespan than NiMH batteries and are better suited for applications that require a lot of charge and discharge cycles.

However, NiCd batteries have some disadvantages compared to NiMH batteries. They have a lower capacity, meaning they can hold less energy and provide shorter run times. They also suffer from the memory effect, which means that the battery can lose its capacity if it is not fully discharged before recharging.

When choosing between NiMH and NiCd batteries, is important to consider the specific application and its power requirements. Both types of batteries have a nominal voltage of 1.2 volts, so it's important to choose the right size and capacity for the device.
NiMH batteries are a great choice for devices that require a lot of power and have a long runtime, while NiCd batteries are better suited for devices that require fast charging times and have a long lifespan.