C battery

It was about the size of a C battery.

“I need to find some C batteries. They said they’d give us gold.”

“I came home,” Lieutenant Cleare said, “and I heard my mother on the phone: ‘All I know is that the bullets are the size of C batteries!’”

Press a button in the handle and two C batteries electrify the racket’s mesh; when a bug’s body hits, there’s a satisfying zzzap.

He spotted the transistor radio, put the C batteries in it, and spun the dial until he got a New York station.