Use Cheap AA Batteries Instead of Expensive 9 Volt Batteries
Testing the 9V Battery Hack (or: Assault on Battery) – xkcd
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SuperCap 9V Battery | Hackaday
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Turn an Ordinary 9-Volt Battery into a Secret Safe « MacGyverisms :: WonderHowTo
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power functions - 9V Battery instead of PF Battery Box - Bricks
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