An artillery battery is an organised group of artillery pieces. It is not a single artillery piece, nor is it used to refer to the effects on the target. It's a noun, not a verb. It's "the artillery battery pounded the Viet Cong", not "the artillery batteried the Viet Cong"
A battery of chickens is an organised group of chickens. The chickens don't batter anything, and neither do the cages
A doctor might order a battery of tests on you, or a schoolkid might take a battery of academic tests - both of these things mean 'organised and related grouping' and not 'batter you down'.
The idea of organised grouping probably came from artillery battery, but in the current day, one of the meanings of battery is most definitely 'an organised, related group'.
A battery of chickens is an organised group of chickens. The chickens don't batter anything, and neither do the cages
A doctor might order a battery of tests on you, or a schoolkid might take a battery of academic tests - both of these things mean 'organised and related grouping' and not 'batter you down'.
The idea of organised grouping probably came from artillery battery, but in the current day, one of the meanings of battery is most definitely 'an organised, related group'.