Nickel-Metal Hydride (NiMH) is a type of rechargeable battery that uses nickel oxide hydroxide and a hydrogen-absorbing alloy as its electrodes. It is known for its higher energy density compared to older battery technologies, such as Nickel-Cadmium (NiCd). NiMH batteries are commonly used in various applications, including hybrid vehicles, portable electronics, and power tools. One of the advantages of NiMH batteries is their ability to hold a charge longer than NiCd batteries, making them more efficient for everyday use. They are also less harmful to the environment since they do not contain toxic cadmium. However, NiMH batteries can self-discharge more quickly than some other rechargeable options, like Lithium-Ion (Li-ion) batteries.