EMC (Electromagnetic Compatibility, referred to as EMC) is defined in the National Standard GB / 4365-1995 "Electromagnetic Compatibility term" in as: "a device or system to work properly in its electromagnetic environment without anything in the environment can not stand the ability of electromagnetic disturbance. " "Able to work" refers to the "electromagnetic sensitivity" (Electromagnetic Susceptibility, called EMS), namely: in the presence of electromagnetic disturbance, device, equipment or system capacity can not avoid performance degradation; "does not tolerate anything in The ability of electromagnetic disturbance "refers to the" electromagnetic interference "(Electromagnetic InteRFerence, called EMI), namely: equipment, transmission channel or system performance degradation caused by electromagnetic disturbance. Therefore, EMC, including both EMS and EMI. Batteries Class A, Class B, C class distinction? Batteries industry has a quality about batteries Classification --A grade, B grade and C grade. A brand new level of acceptable quality batteries; Class B stock is more than three months or reworked batteries; battery manufacturing company based on sales of Class A normal batteries based charging treasure, but because of excess capacity charge treasure Merchants product inventory squeeze lead. Stock more than three months due to the chemical characteristics of the batteries will decay for B grade. Buy mobile power batteries should be concerned about the date of manufacture. Class B relatively inexpensive Guangdong charge treasure, but the recession is very fast. Class C is part of the waste batteries, buy back from overseas electronic waste (laptops, cell phones, power tools, electric cars and other batteries) in disassembled batteries. Have serious quality problems, should belong to eliminate the use of batteries types. Dangerous performance mobile power first in the batteries. Leakage may pose a direct chemical attack on the human body harm, or cause the battery-powered electronic products indirectly caused internal insulation failure of electric shock, fire, and dangerous; electrical core components of environmental pollution, would constitute a direct result of radiation on the human body, or the use of environmental pollution or Recycling environmental damage. Charging treasure manufacturers | Charging treasure | Shuo Shuo provide by Shenzhen New Energy Co., Ltd. Shenzhen Shuo New Energy Co., Ltd. (www.molipow.com/page-about.html) strong, credible, in Shenzhen, Guangdong phone's battery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will be able to lead the Master into the brilliant and you work for a better future!