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Discharge tests and capacity measurement of 9 volt transistor radio batteries at high current, 100mA to 500mA engineering data
how to TEST a 9 Volt (9 V) battery to know if it's GOOD - YouTube
4 Ways to Test Your Batteries - wikiHow
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On a 9-volt battery, which terminal is positive? - Quora
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Testing the 9V Battery Hack (or: Assault on Battery) – xkcd
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