In addition to 3C certification and brand, a portable power bank priced above CNY200 (USD28) is a guaranteed choice for consumers, an industry insider told Yicai amid a recent storm of safety concerns. A quality battery cell, which accounts for half of a power bank's cost and is crucial for its safety level, costs around CNY50 (USD7), so a CNY100 power bank can be problematic, an analyst said to Yicai.