Because like a battery they are the ones that make everything go. Every play in Baseball starts with the pitcher (pitching the ball) and the catcher (giving signs and directing the defense) -- If you dont have the pitcher and catcher, you cant play baseball.. kind of like if a car doesnt have a battery it cant go anywhere
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A 'battery' is baseball lingo for the pitcher and catcher together. An announcer might say something like "The battery for the Giants tonight is Lincecum and Posey".
A batter is a player who is standing at home plate (on offense) attempting to hit the balls, with a bat, being pitched to him so he can get a hit and score runs against the opposition.