Recently, a Qatari technology company has developed a Swapery machine that can charge mobile phones in 7 seconds. It comes with a lightweight battery pack. Users can attach these battery packs to the back of their phone and connect them to the phone charging port. When charging is needed, the user inserts the phone into the Swapery, and the machine will automatically replace the battery pack with another batch of fully charged new battery packs, and charge the replaced battery packs. Some comments suggest that this model, similar to electric vehicle battery swapping and replenishment, is expected to alleviate modern people's anxiety about mobile phone battery levels. Looking at the development trend of the electronic device market in recent years, it is not difficult to see that various manufacturers have been trying their best to alleviate people's anxiety about mobile phone battery levels. Currently, due to limitations in energy density, the development of mobile phone battery technology has entered a bottleneck period. Improving charging efficiency has become an important method for manufacturers to address the issue of mobile phone battery life. So, how does the existing mobile phone charging mode continuously improve charging efficiency? Will the phone battery swapping mode replace the existing phone charging method? The fast charging market is gradually saturated, and the battery life and charging experience are important indicators for evaluating the performance of mobile phones. A few years ago, it usually took several hours to fully charge a mobile phone. Since 2018, due to the development and popularization of fast charging technology, the charging time of mobile phones has been greatly shortened. At present, the fully charged time of mobile phones is generally within one hour. This greatly enhances the user experience. Although there are various terms such as "fast charging", "flash charging", and "overcharging" in the field of mobile phone charging, their basic principle is the same, which is to improve charging efficiency by increasing charging power under certain battery capacity conditions. There are currently three ways to increase charging power, namely increasing voltage, increasing current, and synchronously increasing voltage and current, which have led to corresponding fast charging technology solutions: high-voltage small current fast charging, such as Huawei, Samsung, etc; Low voltage high current fast charging, such as OPPO, OnePlus, etc; High voltage and high current fast charging, like Meizu. Some manufacturers also have layouts in these three fast charging technology solutions. In recent years, fast charging technology has developed rapidly. On the one hand, the proportion of mobile phones with fast charging function is rapidly increasing. With the continuous upgrading of monitors, processors, and 5G applications, the energy consumption of mobile phones is constantly increasing, and fast charging function has become a must-have for smartphones. According to survey data released by market research firm Counterpoint Research, in the first quarter of 2023, nearly 80% of smartphones in the global smartphone market supported fast charging, while in 2018, the proportion of smartphones that supported fast charging was less than 30%. On the other hand, the average power of fast charging increases rapidly. From the first quarter of 2022 to the second quarter of 2023, the average fast charging power of smartphones worldwide increased from 30 watts to 34 watts, with the average fast charging power in the Chinese market reaching 50 watts. With the popularization of fast charging technology, the field of mobile phone charging is undergoing marginal and transitional changes. From the perspective of enterprises, competition on the fast charging track is gradually entering a stage of diminishing marginal returns. At present, fast charging has become a standard feature for smartphones, and the market is gradually reaching saturation. It is expected that mobile phone manufacturers will open up new competitive paths beyond fast charging in the coming years. From the technical side