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Use Foil To Upsize Some Batteries

If you're like us then you probably constantly find yourself with the wrong size battery for whatever you need. The solution, at least half the time, actually turns out to be aluminum foil. Since foil conducts electricity, you can use it to turn AAA batteries into AA and so on. Just place a bit of aluminum foil between the positive terminal and your battery and you have something that's one size up.

This should go without saying, but do be careful not to use too much foil so that it is touching another terminal. This probably shouldn't be used as a long-term solution either.