Standard-Setup with 2xAA?
2 x AA batteries.
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File:4,5V-AA-battery.jpg - Wikimedia Commons
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Custom Alkaline Battery: 4.5V battery pack (3S/S)
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Which would have more capacity between a coin cell battery or two AAA batteries? - Quora
Energy Density of 9V battery vs. AA batteries - Bald Engineer
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AAA battery - Wikipedia
