A portable battery is a compact device designed to store electrical energy for charging various electronic gadgets on the go. These batteries are commonly used to power devices like smartphones, tablets, and laptops when access to a wall outlet is unavailable. They come in various sizes and capacities, allowing users to choose one that best fits their needs. Most portable batteries use lithium-ion technology, which provides a high energy density and lightweight design. Many models feature multiple USB ports, enabling users to charge several devices simultaneously. Some portable batteries also include built-in safety features to prevent overheating and overcharging, ensuring safe usage.