The electric core acts as Its quality directly determines the performance and safety of products. Users who often pay attention to mobile power supply can easily find that it is also a power supply with a capacity of 10000mAh. Brand A can sell for two to three hundred yuan, brand B can only sell for about one hundred yuan, and brand C can even sell for less. What the hell is going on here?

If the bill is from BOM （ Bill of Materials). No matter how it is calculated, it is found that the cost of some mobile power products is higher than the selling price (this does not include packaging costs, storage costs, logistics costs, marketing costs, etc.). But as the saying goes, what I bought is not as good as what I sold. By chance, the author came into contact with a supplier of home appliance cores, providing various imported brand chips, such as Sanyo, Samsung, Panasonic, and so on. The quotation is very cheap. After in-depth understanding, the author found that there was something fishy —— these ones here The foreign battery cells are not new products, but "foreign garbage", that is, second-hand products, or even third hand products. After these secondhand electric cells were transported to China in the form of electronic waste, some people saw the business opportunities, purchased them in batches, and then they carried out simple testing and sorting to select the usable electric cells and supply them to the domestic electric cell market. In terms of purchase price, the price of the second-hand battery cell is about 50% lower than that of the new battery cell, and the battery cell is the most expensive component of the mobile power supply, In order to reduce the cost of products and gain more profits, some mobile power manufacturers will naturally purchase second-hand battery cells.

At present, there are two most common types of cell in mobile power supply: 18650 cell and polymer cell. Among them, 18650 cell refers to a cylindrical battery with a diameter of 18 mm and a length of 65 mm, which has the characteristics of uniform specification and is easy to be recycled for the second time. It has also become the main force of second-hand cells; The shape of the polymer core can be customized at will and is less recycled.

There are obvious redundant solder joints on the metal sheet of the secondary core electrode, which is one of the criteria for judging whether it is a secondary core. Some prudent battery cell suppliers will also directly explain to the purchaser that they are second-hand battery cells, so that the purchaser can know better; However, there are some unscrupulous battery cell suppliers in the market who directly change the packaging of second-hand battery cells, polish the metal contact points, and sell new battery cells for huge profits. The biggest difference between the second-hand battery cell and the new battery cell is the service life. The service life of the new battery cell can be estimated, which is 500 times in theory, while the service life of foreign garbage cannot be guaranteed.

Regular mobile power manufacturers will have a link to use professional battery capacity dividing equipment to test the performance of mobile power before assembly, but many mobile power manufacturers who do not have the strength to purchase second-hand battery cells skip this link and directly ship the battery cell equipment. The quality of the assembled products depends on luck. For ordinary consumers, once there is a problem with mobile power, Basically, they will not be angry about the payment of 180 yuan, and manufacturers can take advantage of this to avoid a disaster.

The eyes of IT media are bright major With the help of the media, the "black core" problem has basically been solved. Mobile power manufacturers who really want to build brands will also strengthen self-discipline. However, the market is still flooded with thousands of mobile power brands. There is still a long way to go to solve all the "black core" problems. For ordinary consumers, it is still the same sentence - one penny, one cent of goods, remember to be greedy for small and cheap, careless support of "black core" products.

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