Life it's full of surprises. Imagine staying at your friends house, in the middle of nowhere. You find out that your car's battery has died. Unfortunately, there are no car's around to ask for the Jump-Start. Pushing is also not an option. You have an important meeting that you can't miss. What do you do? Ask if your friend has a battery operated drill. It might save your day.

As long as the battery is charged and same voltage as cars battery, you might get lucky. Well, actually the voltage can be higher, but I am not sure at what point it becomes dangerous to car electronics. My car's battery is 12v and I used 12v battery from a drill. I believe that a drill with 14 or 16v would be safe to use, but It's just my believe, not a fact. If somebody knows, please feel free to educated me in comments.

This trick will work the best with small cars, small car batteries. Battery can't be completely dead, otherwise it's not gonna work.

In the video, I connected both batteries together. That way, the small battery was charging the big one. I only charged it for 8 minutes. Obviously, my car's battery was dead-ish not completely dead. That's why I was able to do it.