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Among the entire power bank advertisements, manufacturers always use many specifications to describe their products’ advantages. Consumers are so hardly to distinguish them from each other. In such cases, there are three aspects’ standards: capacity, conversion rate, self-discharge rate.
1. According to capacities, power banks can be classified to four grades, as emergency, business, quality, professional power banks. Lower than 2000mAh is emergency ones. 2000 to 4000mAh is business class and they can be used more than 300 times. Quality level is from 4000 to 6000mAh. 8000mAh capacity belongs to professional level. Large capacity power bank require 500 times more cycle life.
2. As to conversion rate, it can be divided into general, intermediate, advanced, super four levels. The relative conversion rates are 60%, 60-80%, 80-90%, over 90%. In the circuit design, the general level is non-synchronous rectification. The other three levels are synchronous rectification.
3. As per self-discharge rate, it can be identified as general quality, good quality, excellent quality. The general quality is with high self-discharge rate, over 1% each day; the self-discharge rate of good quality is 0.4 to 1% each day; excellent quality self-discharge rate is very low, less than 0.4% each day. The lower self-discharge rate means stronger power hold ability. It is decided by the quality of batteries and circuit design.
