A lithium-ion battery sits inside a smartphone sold as an Apple Inc. iPhone 4S in an arranged photograph in Hong Kong, China, on Saturday, Jan. 11, 2014. Apple Inc.'s iOS smartphone operating system gained ground in the U.S. in the final quarter of 2013 as the share of the market served by the platforms of Google Inc., Microsoft Corp. and BlackBerry Ltd. shrank. Photographer: Brent Lewin/Bloomberg via Getty Images
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