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I think this one fake, it says put it on the positive side, but in the pic its on the negative side.
plus AAA are weaker than AA arent they?
it works, i think they mean fil the gap on the negative side with foil to have the end reach the positive side.. although i dont see why this wouldnt work on the positive side aswell
the foil does nothing but transmit the energy, but if you have a device that requires you to put one battery positive side up and one positive side down and theyre next to each other, make sure to always put the foil on the negative side.. that way the foils cant touch, if they do it could break your device (only if one foil is on the positive and one is on the negative side)
edit: and about the batteries being weaker: yeah, they run out of energy much faster, and most portable devices should also work with lower power..