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While the Lithium-ion market is quickly overtaking other rechargeable battery technologies, there are emerging options of Li-ion batteries available, including: the replacement of Cobalt-based cathodes with alternatives; the availability of high current cells to the general market; the rapid adoption of ultra-thin Lithium polymer cells; and large format high-capacity batteries. Learn about the basics of battery pack construction and chemistry, including choices and trade-offs, plus recent innovations in cells and their impact for designers of portable and mobile devices.