Duracell 9V/1, 6LR61, 9V1, MN1604, 6LR1, PC1604, 1604LC, K9V, 6AM-6, 4022, 6AM6,

Alkaline batteries

A nine-volt battery, either disposable or rechargeable, is usually used in smoke alarms, smoke detectors, walkie-talkies, transistor radios, test and instrumentation devices, medical batteries, LCD displays, and other small portable appliances.