Why ...........

[Suechooks]

......are caged hens called "Battery hens"?

[grenhouse]

Would have thought it's to do with the name of the cages? Don't ask me why battery cages are called battery cages though!

[chris]

Not sure, is it because they're just churning eggs out, and doing nothing else?

As in powering then out?

[Nicos]

close contact ( a collection or gathering of..)!....
word of the day battery | podictionary - for word lovers - dictionary etymology, trivia & history

[Suechooks]

Thanks Nicos - knew I could rely on the Queen of Google!

[Two_Sheds]

Nicos is good ain't she?

Battery: a group of similar things arranged, connected, or used together; set or series; array: a battery of microphones, a battery of school achievement tests battery - Definition of battery at YourDictionary.com

[Hilary B]

I knew the connection was with a collection of guns being a 'battery', but not the rest of it.