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According to the national standard battery, especially polymer battery has a strict hierarchical system. According to the battery's quality and timeliness are divided into three levels-a b and c. A-a brand new battery, b-a stock for more than three months, or disassemble the battery, c – waste batteries. Special note c while cheaper, but there are serious quality problems, and b electricity prices low, but may be in recession. Buyers should buy according to actual situation.