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Lithium-ion batteries are smaller and more powerful than other batteries: Secondary batteries that can be recharged and used repeatedly like lithium-ion batteries include nickel-metal hydride batteries and nickel-cadmium batteries in addition to lead-acid batteries. The most obvious advantage of lithium-ion batteries compared to these batteries is that they are small and light, and yet powerful.http://www.yatfeibattery.com/lithium-battery/