Electrical Engineering 101
Batteries are expensive. They were never cheap but are needed for many electrical appliances and devices to function. Also, every kind of device requires certain types of battery sizes which is annoying when you have the wrong type of batteries lying around. Except that didn’t stop this individual from using their basic knowledge of electrical engineering.

Although the device they want to use needs AA batteries, this person only had two AAA batteries. The solution they came up with was to use a leftover coil, aluminum foil, and those AAA batteries. With a little bit of McGuyver’s knowledge, the device is still functional.