battery

A battery isn't just the thing that powers your phone! While we usually think of those small cylinders that give life to our devices, the word has a much "punchy" history. Rooted in the idea of "beating," it originally described a group of cannons working together to strike an enemy. This sense of a "concentrated force" is why we also use it in law—where "battery" refers to the physical act of hitting someone—and in everyday language, like a "battery of tests" or a "battery of questions" that feels like an overwhelming barrage all at once.

The word "battery" has surprisingly diverse meanings, all stemming from its historical roots in warfare and the Latin battuere, meaning "to beat." Originally, a battery referred to a group of cannons or artillery pieces used together to deliver a concentrated blow. This military sense is still used today; you might hear about an army deploying a battery of heavy weapons to breach a wall. This "beating" origin also explains the legal term: while "assault" is the threat of violence, "battery" is the actual physical contact or harm.

In the 18th century, Benjamin Franklin famously borrowed this military term to describe a set of charged glass jars. He felt that the way they discharged their energy all at once was similar to a battery of cannons firing. This is why we call our modern chemical power cells "batteries." Whether it is a tiny button cell in your watch or a massive pack in an electric car, it represents a stored force ready to be released.

Beyond technology and law, we use battery to describe any large group or series of related things that act together. A job applicant might face a battery of interviews, or a patient might undergo a battery of medical tests. In every context, the word points to concentrated force or coordinated action—be it physical, chemical, or metaphorical.