A fully charged 20,000mAh power bank should charge an iPhone 4 – 6 times from zero to full charge, before needing to be recharged itself. It should charge most modern Android phones 3 - 4 times from zero to full charge. If you’re using it for charging a tablet device, it should fully charge a large tablet once, or a small tablet twice. This 22.5W power bank can charge your phone or tablet faster than a standard 10W power bank. Featuring a matte, textured surface, with a smooth space to brand your company logo or message, finished off with shiny gun metal trims. The LED display will help you keep track of how much power is remaining in your power bank.