limited offer US $19.02 Power Bank 30000mAh TypeC Micro USB QC Fast Charging Powerbank LED Display Portable External Batter

Power Bank 30000mAh TypeC Micro USB QC Fast Charging Powerbank LED Display Portable External Batter

[4000007429879] -Asometech 30000mAh QC Fast Charging Power Bank 3 Inputs -Micro Input: DC 5V-2.1A Max -Type C Input: DC 5V-2.1A Max -For iPhone Input : DC 5V-2.1A Max 2 Outputs -Double USBDC 5V-2.4A Max -Battery Capacity:30000mAh/3.7V, 111Wh -Rated Capacity: 22000mAh -Size: 154*74*33mm -Weight:About 600g(Not included package) -Product Certification:CE, RoHs, FC Compatible Model -USB Type C QC Fast Charging Power Bank For iPhone X Xs XR Xs Max 8 8 Plus Powerbank -External Battery Pack For Xiaomi Samsung Huawei Phone Power Bank Powerbank -QC Fast Charging for MacBook Samsung Huawei Dell Asus Laptop Note: Please fully charge the power bank first when using it for the first time. The normal energy of 30000mAh battery capacity power bank is 30000mAh*3.7V=111000mWh, when it charges phones, the output will be 3.7V/5V*30000mAh=22200mAh. Note: It's not correct that some buyers test the capacity of our power bank with USB tester and thought the capacity is less than we marked. Why the battery capacity is 30000mAh and the rated capacity is only 22000mAh? There are two reasons: 1. Law of conservation of energy The unit to measure the power bank is not only the mAh, but also the mWh (mAh*V=mWh). The voltage of power bank is 3.7V according to lithium battery standard, while most mobile phones, computers and other mobile devices are the standard 5V voltage for USB interface. Therefore, the power bank needs to boost the voltage to 5V before charging the phones. The normal energy of 30000mAh battery capacity power bank is 30000mAh*3.7V=111000mWh, when it charges phones, the output will be 3.7V/5V*30000mAh=22200mAh. 2. Energy loss during charging The power bank cannot output the 100% energy during the process of charging due to the energy loss of boosting voltage. And the conversion rate will be influenced by the output current. Generally, when the output current is 1A, the conversion rate is higher than when the current is 2A. Please note that the conversion rate is basically in the range of 60% -70% in the entire power bank industry. There are two capacity standards for power bank, one is the lithium battery capacity (the capacity we write in our product title), and the other is the rated capacity (the capacity measured by buyers with USB tester). For example, the power bank of some famous brands have a rated capacity of 18,000-19500mAh for their 30,000mAh battery capacity. Google it for more detailed information about battery capacity and rated capacity.