You checked your batteries and you find corrosion.
What do you do now?
The good news is that in most cases you can clean the corrosion and have your battery-powered device back in working order. It only takes a few minutes and only costs a few pennies for each cleaning. There are multiple ways of doing this, but here is a video that explains how to use white vinegar and Q-tips to clean battery corrosion.
There are other ways to clean corrosion that I will cover in future posts but keep this one in mind the next time you encounter it.