Nickle-Cadmium was the best battery before Lithium-ion due to its size and ability to hold a charge. But, the Lithium-ion battery has been the most promising due to its ability to increase in efficiency.
This link from the battery university provides the history and current state of the Nickel-Cadmium battery: http://www.batteryuniversity.com/partone-4.htm
This pdf supplies some information on the lithium battery and highlights how lithium deposits are small and hard to get: http://www.evworld.com/library/lithium_shortage.pdf. Or you can just check out http://www.evworld.com
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