A battery can be a dozen different things, but the names for all of them come from the same source.
I love this. I love the way the meaning of a word can flow in strange directions and take you almost anywhere.
How come a line of hens in cages have ended up with the same name as a chess move and a set of cymbals?
Well, you get a clue if you look at some of the different sorts of batteries there are.
There's the sort that have just given up powering your Christmas presents, for a start; then there's a cunning chess ploy; the percussion instruments of an orchestra; the catcher and pitcher of a baseball game; a series of cages for hens live in; a group of psychological tests, or a group of other things, such as questions, lipsticks or pencils;
...then there's touching someone in a hostile manner (that sort of battery is an English legal term); a place to arrange your cannons; and an array of guns or searchlights all operated from the same switchboard.
The thing they have in common? Can you spot it?
Yes, it's power, and often power-in-numbers (yes, lipstick is powerful stuff. And so are pens).
Have a look at what you have arranged in a battery, and ten to one you'll find out what sort of power is important to you.
You might even not need to do all those psychological tests, then.
Spit the frippet: battery. All these words come from the Old French batterie, beating, from the Latin battuere, to beat.