Not sure how it's an English question, but Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode.
Antecedents should be placed <u><em>before</em></u> the pronouns they modify.
