Due to various manufacturers' differences in the production technology of power bank, even if power banks are of the same battery cells and the same capacity, they also have apparent differences during the actual charging process. So in the process of purchasing power banks, consumers do not blindly pursuit large capacity, but pay attention the more important part, the actual conversion rate.
Actual conversion rate of power banks can be calculated to obtain through the formula "(the actual discharge capacity x average discharge voltage) / (battery cell capacity x 3700mV) = conversion efficiency". A high quality power bank enjoys conversion rate in between 85% to 90%, which means a qualified power bank 5000mAH actually charges between 3,500mAH to 4,000mAH during charging the mobile phones, at least giving the mobile phone one full charging.
Currently most of the smart phones can standby for in a day or so. If it is equipped with a 5000mAH power bank, it will be ensured for two days of normal use, which can meet most people's everyday use needs. So when buying power banks, consumers have no need to buy power bank more than 10,000mAH. Just choose a qualified power bank according to their needs.
Lithium Polymer Battery Cells Are Reliable
Mobile power banks for sale currently on the market are mostly adopting lithium polymer battery cells and 18,650 battery cells. 18,650 battery cells are usually packed in cylindrical steel shell, and lithium ions inside is liquid. Because it is the industry standard specifications, 18,650 can only be cylindrical. If customers find power banks in big style during purchasing mobile power banks, they can be basically determined as 18,650 battery cells. Currently in order to reduce the cost in pursuit of low prices, many power banks on the market adopt inferior 18,650 batteries, which is impossible to defend. Compared with Lithium polymer batteries, 18,650 battery cells suffer much lower safety factor. If the quality cannot reach the standard, there may even be explosion.
Lithium polymer batteries, with aluminum-plastic film packaging as mainly used outer package, paste lithium materials inside, can be customized the shape, such as 0.25mm ultra-thin batteries. Thus, power banks with polymer batteries can also be designed to be more flexible in appearance. Compared with 18650 batteries, lithium polymer batteries will not explode, only a very small probability that there will be a fire hazard, with much better security than 18650 batteries. When users buy power, the most direct way to determine battery cells is by moving the power bank profile. If they appear flat or long fashion styling, they generally use polymer batteries.
Because of the cost, most of power banks with capacity in excess of 10,000mAH adopt 18,650 battery cells, which not only could pose a security risk, but also the 18,650 cell conversion rate is not as good as that of lithium polymer batteries. So consumers do not blindly pursuit large-capacity power bank.<br/>
www.external-battery.net is a professional and famous 6000 mAH external battery manufacturer and exporter in China. With our own professional R&D center, factory and marketing team, we devoted ourselves to offering customer with innovative 3C products.