The world's biggest battery looks nothing like a battery | TED-Ed

As of 2020, the world's biggest lithium-ion battery is hooked up to the Southern California power grid and can provide enough power for about 250,000 homes. But it's actually not the biggest battery in the world: a pair of lakes are. How can lakes be a battery? Explore how inventors are rethinking what a battery can be, and how these surprising solutions could help us achieve a sustainable future. [Directed by Lisa LaBracio, narrated by Jack Cutmore-Scott, music by André Aires].