Batteries

noun

1. A device used to power electric devices, consisting of a set of electrically connected electrochemical or, archaically, electrostatic cells. A single such cell when used by itself.
2. The infliction of unlawful physical violence on a person, legally distinguished from assault, which includes the threat of impending violence.
3. A coordinated group of artillery weapons.
4. An elevated platform on which cannon could be placed.
5. An array of similar things.

   "Schoolchildren take a battery of standard tests to measure their progress."