Summary: Discover the 2024 evaluation criteria for outdoor power supplies, including safety certifications, battery performance metrics, and industry-specific requirements. Learn how these standards impact purchasing decisions across camping, construction, and emergency. . External Power Supplies (EPS) are devices used to supply electricity to, and to charge built-in batteries of electronic and electric devices such as laptops, mobile phones, tablets, MP3 players, electronic cigarettes, electric tooth brushes, electric shavers, etc. For products without built-in. . This guide breaks down key performance parameters using the Outdoor Power Supply Performance Parameter Table, helping professionals make informed decisions. Let's explore how these specifications impact real-world applications. Imagine buying a car without checking its horsepower or fuel. . USB EPS must have at least one compliant USB-C port and no requirements regarding any “USB-A” port. The defined markings set minimum average eficiency and maximum no-load power consumption levels for EPS.