O'Neill 2.25W 20000mAh Power Bank. The O'Neill 22.5W 20000mAh Power Bank has a high capacity of 20000 mAh. Built-in smart USB charging controller. Compatible with most phones and digital devices. It also comes with a sleek carbon fiber finish that will contrast perfectly with your logo. This Power Bank 20,000mAh has two USB-A output ports and two input ports (a USB-C and a Micro-USB port). Each output port with a maximum output of 18 W when used alone. The combined output of the two ports can reach 5V/4.5A, so it can be used to charge both phones and tablets. Added protection and enhanced safety. The high-precision resistance, inductance, and capacitance components and advanced circuit chips can easily tackle overcharging, over-discharging, overheating, short circuits and other faults.