Qumo Premium Power Bank [13000 mAh] Ultra-Portable External Battery Charger [Multi-Functional Compact Size Universal Power Bank] for Smart Phones and Other Digital Devices Good battery inside we use Li-ion 18650 china mainland cells to provide you with the best quality on the market, it guaranties you that you new Q15 power bank has the good quality cells inside. Real battery capacity 13000 mAh it gives you up to 4 additional full charges of your Smartphone (Galaxy S6 up to 303% (3 times), iPhone 6s up to 330% (3.3 times)) and will help you not to run out of energy. Up to 2A output it allows you to charge you phone up to four times (comparing to 0.5A output models) faster and gives you the opportunity to save time on charging you device, also 2A output gives you the possibility to charge tablet PC and portable devices with high capacity battery inside. Auto output correction - it guaranties you, that your device would not be damaged by overvoltage or overload - our power bank will give your device as many ampere as it needs and will correct the output voltage and ampere in intelligent mode. Short circuit, overvoltage and overheat protection - our power banks have been protected from main risks on PCB level - it means that using of our products is safe both for user and for his device, just plug in and have fun.