A Nickel-Metal Hydride (NiMH) battery is a type of rechargeable battery that uses nickel oxide hydroxide and a hydrogen-absorbing alloy as its electrodes. NiMH batteries are known for their higher energy density compared to traditional Nickel-Cadmium (NiCd) batteries, making them suitable for various applications, including electric vehicles and portable electronics. These batteries are environmentally friendly, as they do not contain toxic heavy metals like cadmium. NiMH batteries also have a lower self-discharge rate than NiCd batteries, allowing them to retain charge longer when not in use. They are widely used in hybrid cars and consumer electronics.