The UPG Universal Battery is a maintenance-free AGM sealed lead-acid unit that has a versatile array of applications. From power back-ups to power wheels, it can function safely no matter how it's mounted. Each one of these 12V group 27 battery features easy-to-tie-into terminals that can be accessed quickly. They are a reliable power source that gives a steady enough supply that they are often used for medical equipment back-up. Each battery is long-lasting and should be replaced every 3 to 5 years.