First, do not buy special low price mobile power. In the purchase, "penny stock" This sentence must be placed on the heart. Of course, do not rule out the market there will be some high-quality products, or businesses for a better quality of products for promotion, but these are one example. Simply from the cost calculation, you can easily filter out some serious vacuity electricity inferior products. The current use of more mobile power 18650, for example, the capacity of single batteries in about 2500 mA or so, the price of 10-30 yuan range, plus housing, packaging costs and a reasonable profit businesses, the a nominal 10,000 mA mobile power price should be at least 100 to 200 yuan between. If it is some brand-name products, with R & D costs and brand value, the price is a little higher. This calculation, online sales of those so-called "monthly sales ten thousand", "30000 mA is also only 90 yuan shipping" propaganda to go too.
Secondly, try to choose big brand products. Mobile power supply in the final analysis, so the purchase can be first in line to look at the power of the enterprise information designed to do, these companies produce mobile power is trustworthy. In general, the production of mobile phone battery or batteries, lithium battery mobile power companies produce more trustworthy, and its product quality more secure. In contrast, those OEM, OEM manufacturers of products, as well as unlicensed product is not recommended for consumers.