Why is a group of artillery called a battery?

The Origins of the Military Battery

Ever wonder why a military unit of heavy firepower is called a battery? Long before the word became associated with the lithium-ion cell powering your phone or car, it had a purely tactical meaning on the battlefield.

Historically, the term referred to a cluster of cannons operating together as a unified group. Back in the days of smoothbore gunpowder artillery, commanders would position these heavy guns side-by-side either in a temporary field setup during an open engagement or pointed directly at the reinforced walls of a fortress during a siege.

What makes this interesting is that these historic groupings were not necessarily uniform. A single tactical battery often featured a deadly mix of different ordnance types—including standard cannons for flat-trajectory fire, howitzers for lobbing shells over obstacles, and heavy mortars for high-angle plunging fire. By combining these varied weapons into a single coordinated striking point, armies could concentrate maximum destructive force against a specific target.

Benjamin Franklin famously borrowed this very military concept later on, using the word to describe his linked array of charged glass plates because the multiple units stored and discharged electrical energy together, much like a coordinated row of cannons unleashing a combined salvo.