The nine-volt battery is a common size of battery introduced initially for the transistor radios. It does not refer to every battery pack of 9 volts, but represents a battery type which has a nominal voltage of 9V and measures 26.5mm in length, 17.5mm in width, and 48.5mm in height. Usually, they are a good companion for walkie-talkies, clocks and smoke detectors.
6F22 is the 9V battery using the carbon-zinc chemistry, delivering 300 to 400mAh of power, while 6LR61 uses the alkaline system and stores energy of about 550mAh. The size, regardless of chemistry, is typically called PP3—a designation originally used solely for carbon-zinc.
Caution: Because of the proximity of the positive and negative terminals, the battery should be kept in its package before going to be used.
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