Nickel Metal Hydride (NiMH) batteries are a popular choice for powering remote control (RC) cars due to their high energy density and long life. However, like all battery types, they also have their own set of advantages and disadvantages.

Advantages:

1. High Energy Density: NiMH batteries have a higher energy density than Nickel-Cadmium (NiCad) batteries, which means they can store more energy in a smaller package. This makes them ideal for use in smaller RC cars.
2. Long Life: NiMH batteries are known for their long life, which is typically measured in terms of the number of charge-discharge cycles. This makes them a cost-effective option for RC car enthusiasts who use their cars frequently.
3. Low Memory Effect: NiMH batteries have a low memory effect, which means that they can be charged and discharged at any time without affecting their performance. This is unlike NiCad batteries, which can develop a "memory" that reduces their capacity if they are not fully discharged before being recharged.
4. Environmentally Friendly: NiMH batteries are more environmentally friendly than NiCad batteries as they do not contain toxic metals.

Disadvantages:

1. Cost: NiMH batteries are typically more expensive than NiCad batteries, which can be a drawback for some users.
2. Self-Discharge: NiMH batteries have a higher self-discharge rate than NiCad batteries, which means they lose their charge more quickly when not in use. This can be a problem for users who don't use their RC cars frequently.
3. Temperature Sensitivity: NiMH batteries are more sensitive to temperature changes than other types of batteries. This means that they may not perform as well in extreme temperatures, which can be a problem for outdoor use.
4. Capacity Decrease: Over time, the capacity of NiMH batteries will decrease, which can be a problem for users who want to use the same batteries for a long period of time.

In conclusion, while NiMH batteries offer many advantages over other types of batteries, they also have their own set of disadvantages. It's important to consider these factors when deciding whether to use NiMH batteries in your RC car. It is always recommended to read the manufacturer's instructions and guidelines before using any type of batteries.