High-capacity power banks are designed to store significant amounts of electrical energy. Most of them have capacities that range anywhere from 10,000 mAh to 30,000 mAh or more. These power banks are capable of charging smartphones and even tablets and laptops several times. They often use lithium-ion battery cells with high energy density. Some high-capacity power banks are equipped with advanced features like fast charging, several output ports, including USB-C for high powered devices, and built-in LED indicator lights that show the remaining battery level accurately to high power users