Previous experiences with 87W portable power banks equipped with a capacity of 20,000mAh and supporting output of 65W in AC mode were disappointing. The lack of a built-in cable was particularly frustrating. However, using a power bank with a built-in cable for a period of time revealed the immense convenience it offered. Unfortunately, a thorough search online failed to yield a product that met the desired specifications. Some options either exaggerated their abilities or claimed to support 65W output, but only in power bank mode, resulting in a paltry 20W output when operating in AC mode. Others lacked built-in cables altogether, leaving users to seek alternative solutions.