Duracell offers a wide range of batteries to be used in electronics that require reliable power. This double pack of Duracell Plus 100 9 volt cells is the perfect power source for all of your 9 volt devices.These batteries are Duracell\'s recommendation for everyday devices 9 volt batteries are regularly used in smoke alarms, smoke detectors, walkie-talkies, transistor radios, medical batteries, LCD displays, and other small portable appliances. Duracell was used during the 1969 Apollo 11 mission and became the first battery on the moon.. Superior Nylon top closure helps preventing our batteries from leakage. Powers 9 volt appliances and tools