The schematic diagram of a power bank usually consists of three main components: the battery, processor, and charging terminal. The battery is typically a lithium-ion cell that provides power to the device while it charges. A power bank, or a portable phone charger, is a portable device that stores electrical energy and can be used to recharge electronic devices like smartphones, tablets, and laptops on the go. Common internal elements include: 1. Ranging in size from slim, pocket-sized devices up to larger, high-capacity power banks – they can be used to charge cell phones, tablets, cameras, portable speakers. But have you ever wondered what power banks are made of? Understanding the materials and components that make up these versatile devices is essential for making informed purchasing decisions.