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Lithium batteries. Batteries are used as a source of electrical power, converting chemical energy into electrical energy via a reaction. For lithium batteries, the reaction is between lithium metal (Li) or lithium-based compounds and another chemical. For these batteries, branded 'Ultimate Lithium' from the Energizer company, the chemical reacting with the lithium is iron disulphide (FeS2). These are AA batteries, producing a voltage of 1.5 volts. The positive terminal of the batteries is marked with a plus sign.
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