Duracell 9V batteries are multi purpose alkaline batteries ideal for reliably powering everyday devices that require a kick of additional power. These batteries give you the freedom to enjoy the use of your appliances by giving you a product you can rely on. The Duracell 9V batteries are best used when you are looking for reliable and long lasting power in regularly used devices such as large flashlights, smoke alarms, clocks, remote controls, etc.