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The lead acid battery, invented more than 150 years ago, is the oldest type of battery. Its technology is based on the principle of electrochemistry. The main components of a lead acid battery are electrodes, which are composed of lead, and electrolytes, which consist of an acid. The acid reacts with the lead from the electrodes and forms a lead compound. The electrodes, which are of opposite polarity, react with the acid while discharging.