Convert AAA Batteries To AA Batteries With Some Tin Foil
All you need to do is fold up a small piece of tin foil to fit (make up the size difference) at the negative (flat end of the battery with the -) end of the battery. You want enough tin foil to create a firm fit on the battery to ensure both the positive and negative terminals on the device are touching on the positive/negative ends of the battery.
This tip works great at a pinch, but it shouldn’t be considered a permanent solution.
Source:
http://www.knowledgeweighsnothing.com/convert-aaa-batteries-to-aa-batteries-with-some-tin-foil/
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