PowerUP Ultra Alkaline 9V Batteries (Pack of 4) - Draper 03980, With 20% more capacity than standard alkaline batteries, these multipurpose Draper PowerUP Ultra Alkaline D size batteries are ideal for high-capacity applications.D size batteries are used in high-drain applications requiring extended run time, such as radio transmitters and receivers, megaphones and transmitters.These Draper PowerUP D size batteries are designed to be leakproof and come in two handy pack sizes. Draper 03980 PowerUP Ultra Alkaline D Batteries (Pack of 12)