What metal is oxidized in a non - rechargeable flashlight battery? Enter the chemical symbol of the element

Batteries are everywhere. The modern world is dependent on these portable sources of energy, which are found in everything from mobile devices to hearing aids to cars.

But despite their prevalence in people's daily lives, batteries often go overlooked. Think about it: Do you really know how a battery works? Could you explain it to someone else?

Here's a rundown of the science behind the energy source powering smartphones, electric cars, pacemakers and so much more.