It seems terribly inefficient to manufacture six individual AAAA batteries then stuff them in a housing to make a 9 volt battery. Why are 9V batteries made that way? - Quora
Multimeter 9V Battery Test (How-To Guide)
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How to Test a Battery
how to TEST a 9 Volt (9 V) battery to know if it's GOOD - YouTube
Testing 9-volt batteries with your tongue.
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