Core Viewpoint - The article discusses the complexities and challenges of smartphone charging technologies, highlighting the evolution of battery capacities and the emergence of various fast charging protocols that have made charging more complicated than before [1]. Charging Technology Overview - Early smartphones had smaller battery capacities and adhered to a unified USB charging standard, which allowed for relatively straightforward charging processes [1]. - Modern smartphones now often exceed 5000mAh in battery capacity, necessitating faster charging solutions to avoid lengthy charging times [1]. Fast Charging Protocols - **PD (Power Delivery)**: A universal protocol supporting USB Type-C devices, capable of delivering different voltages (5/9/12/15/20V) with a maximum power of 100W (PD3.0) or 240W (PD3.1) [2]. - **VOOC**: Developed by OPPO, this protocol features low voltage and high current options (e.g., 5V/6A, 10V/6.5A, 20V/7.5A), allowing for efficient charging with minimal heat generation [4]. - **SCP (Super Charge Protocol)**: Exclusive to Honor devices, SCP utilizes high voltage and high current, with options like 5V/4.5A and newer versions supporting 10V/4A and 20V/5A [5]. Compatibility Issues - Fast charging protocols are often incompatible with one another, requiring users to ensure that their devices, charging heads, and cables all support the same protocol for optimal charging speeds [5].