关键词：手机电池；单电源设备；电池组成
摘 要：Wireless technology has been evolving at a breakneck speed. The total number of cell-phones in use (as of 2011) was over 6 billion for a 7 billion world population constituting 87 % of the world population. Additionally, with user convenience becoming paramount, more and more functions are being implemented wirelessly. For example, the U.S. army utilizes 40 different types of radios for its communications. Moreover, there is a considerable effort toward integrating all this wireless functionality in a single device. Smartphones today use as many as a dozen independent radios inside them.