Xiaomi's new UltraThin Magnetic Power Bank 5000 15W challenges assumptions about battery capacity equivalence. While both Xiaomi and EcoFlow offer 5,000mAh power banks, their physical dimensions and performance differ dramatically. The Xiaomi model weighs just 98g and measures 6.0mm thick, making it nearly half the weight and thickness of EcoFlow's 180g, 14.4mm thick alternative.

The size difference stems from Xiaomi's cutting-edge Silicon-Carbon battery with 16% silicon content, while EcoFlow includes integrated charging cable and kickstand. In practical charging tests using an Oppo Find X8 Ultra, the EcoFlow delivered faster charging speeds - reaching 41% in 15 minutes versus Xiaomi's 20 minutes. Throughout the test, EcoFlow maintained 35% faster charging, matching its advertised 30W USB-C output against Xiaomi's 22.5W.

However, capacity efficiency tells a different story. The EcoFlow added approximately 3,900mAh to the phone's battery, while Xiaomi delivered about 3,600mAh - roughly 8.5% less power despite identical rated capacity. This demonstrates that two 5,000mAh batteries aren't necessarily equivalent in real-world performance, with various USB-C transfer inefficiencies affecting actual output.