Apple will use stepped lithium-ion batteries in its upcoming iWatch, according to a report from The Korea Herald. The batteries will be supplied by LG Chem, Samsung SDI, and Tianjin Lishen Battery, sources said. As the report notes, a stepped battery uses layers of batteries to offer more energy efficiency in a footprint similar to a regular battery. The report also suggests the iWatch is “unlikely to sport a curved screen.” LG Chem announced…
