Size D batteries are typically used in high current drain devices, such as large flashlights, radio receivers and transmitters, products with electric motors or other applications that require an extended running time. Keep a pack of ACDelco D Batteries on hand to make sure your devices are always operational. And you can count on our ACDelco Super Alkaline Batteries to deliver maximum power and last three times longer. Everyone wants a brand they can trust. Dependable and reliable, ACDelco brand represents quality batteries and products.