Duracell® Coppertop all-purpose alkaline batteries are not only dependable, they are also long-lasting. You can take comfort in a 10-year guarantee (five-year guarantee for 9V) in storage. They are great for many of the devices you use on a daily basis. From storm prep to holiday needs, Duracell® is your trusted battery brand. Battery Type: Alkaline; Battery Size: C; For Use With: Everyday Electronic Devices; Voltage: 1.5 V.