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The Samsung black fast charge battery pack has a capacity of 5100 mAh for extended use and multiple charges. With pass-through charging, this battery pack and a connected device can charge overnight. It has four LED indicators to display remaining charge. This battery pack is perfect for Samsung devices with fast charge that charges your battery from 0 to 50 percent in about 30 mins. It charges non-fast charge and non-QC 2.0 devices at up to a 2A speed. This battery pack is compatible with Galaxy S7 and Galaxy S7 edge.