So this means a 10000mAh power bank can charge 3000mAh smartphone twice. Factors That Affect Real-World Charging Efficiency and Actual Power Delivered. Qualcomm Quick Charge (QC): Qualcomm's fast charging standard reduces charging time by many hours. A QC 3.0 charger with a high capacity can fully charge a 3000mAh battery in less than an 4years ago. Updated. The time it takes to recharge your power bank is dependent on a number of factors such as the size of your power bank battery (mAh) and the wall charger you're using. Below is our table that shows approximate charge times for each sized power bank for the different type of wall charger you're using. A10000mAh power bank has a capacity to store 10,000 milliampere-hours of energy. This capacity determines how many times it can charge various devices before needing to be recharged itself. How Many Charges Can a 10000mAh Power Bank Provide? nXJMxB.