In 1800, Alessandro Volta created the "voltaic pile"—the world's first true battery—by stacking alternating zinc and copper discs separated by brine-soaked cloth, producing steady electrical current.

Lithium cobalt oxide has a layered structure allowing lithium ions to move in and out easily, enabling the first commercial Li-ion batteries.

Lithium-ion batteries power about 80% of electric vehicles, offering enough energy density for 200+ miles on a single charge.

An electrochemical cell is the basic unit that converts chemical energy into electrical energy, as found in a single AA or AAA. A battery consists of one or more such cells connected together.

The electric eel's stacked electrocytes function like a biological battery, generating up to 860 volts, which Volta mimicked in 1800 with his voltaic pile of alternating metal discs and brine-soaked cardboard.

Degraded EV batteries retain 70-80% capacity, making them suitable for stationary grid storage to balance renewable energy fluctuations without the demands of vehicle use.

Volta's voltaic pile generated electricity through the electrochemical reaction where zinc oxidized more readily than copper, driving electrons from zinc anode to copper cathode via an electrolyte.

Solid-state batteries use non-flammable solid electrolytes instead of liquid ones, potentially making future batteries safer and more energy-dense.