Charged up! The science of batteries

Batteries are everywhere — they’re in our phones, our computers, our cars, our toys. But how do they work? To find out, we talk to a scientist who’s making really big batteries to store renewable energy, another who’s working on really small ones to power our phones, and we play in a park with a dog. All that, plus the mystery sound!

This is the third episode in a four part series:

• Part One: Shocking! The science of static

• Part Two: High voltage! How electric power reaches your outlet