Recommended
Jump Start a Car with AA Batteries
Why people recommend it
Enjoyed as an informative stunt in which ElectroBOOM starts a car from AA cells, and cited as proof that a weak battery can be nudged back into service.
Watch for: A playful stunt, so check polarity before copying
In their words
Here's the video where I learned the AA battery trick.
HaLo2FrEeEk on electronics.stackexchange.com, Mar 2017. CC BY-SA.
Oh, and the Electroboom guy is this guy:
Sredni Vashtar on electronics.stackexchange.com, Jun 2017. CC BY-SA.