Beating (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">beating</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for battery that I've seen before include "One may be charged" , "associated with assault" , "Power source; artillery unit" , "Power cell" , "Means of storing electric current" .)
(Another definition for bashing that I've seen is " Violently striking; severely criticising".)