An insight into the Ultralife 9Volt - the Longest Lasting 9V battery
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22 - HiTech 9V Li-ion battery: teardown, repair and test - YouTube
Ultralife - 9Volt
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4 Ways to Test Your Batteries - wikiHow
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Discharge tests and capacity measurement of 9 volt transistor radio batteries at high current, 100mA to 500mA engineering data