The Anker Advantage: Join the 50 million+ powered by America's leading USB charging brand. High Cell Capacity: Contains 5,000 mAh of power. Enough to provide over an entire replacement charge for iPhone X and Samsung Galaxy S9, or almost 2 charges for iPhone 8. High Cell Capacity: Contains 5,000 mAh of power. Enough to provide over an entire replacement charge for iPhone X and Samsung Galaxy S9, or almost 2 charges for iPhone 8.