The combination of lithium with the inorganic compound manganese dioxide is the driving force behind what is now the most common type of lithium battery found in today's portable consumer electronic devices. Encompassing nearly 80% of the lithium battery market, lithium manganese dioxide batteries come in a wide variety of shapes and sizes and are featured in handheld video games, watches, portable power tools, MP3 players, digital cameras and a multitude of other portable electronic devices.