A Battery is a device for storing electrical energy. It consists of an Anode, Cathode, and Electrolyte. The electrolyte in moped batteries is Sulfuric Acid and is often purchased separately and added to the battery by the user if it was purchased online. Typical moped batteries have a plastic casing that should be inspected for cracks or signs of leaking. It will have + (positive) and - (negative) terminals. These should be kept clean and should be connected according to the labeling or manufacturers instructions to avoid damaging electronic components. Some mopeds use the battery for a voltage regulator and without the battery will blow light bulbs.