This $20 Battery Stores Electricity for 100 Hours — No Lithium Needed! (Physics Explained)

What if a $20 battery could store electricity for 100 hours — without lithium, cobalt, or the fire risk of conventional battery systems? Meet the Iron-Air Battery, a long-duration energy storage technology that uses iron, water, and air to store electricity for days instead of hours. Its secret is surprisingly simple: reversible rusting. In this video, we break down the physics behind iron-air batteries, how they compare with lithium-ion storage, why 100-hour storage could matter for solar and wind power, and how this technology could help keep the grid running through multi-day energy shortages. Could iron, water, and air become one of the keys to cheaper, more reliable renewable energy storage? Here’s how the technology actually works. #IronAirBattery #EnergyStorage #BatteryTechnology #RenewableEnergy #PhysicsExplained