1. The volume and weight of the mobile power supply are directly proportional. The greater the capacity, the greater the volume and weight. Mobile power supply is portable in nature. If you make a 1.5 milliamp mobile phone power supply, you will basically hold it all the time.
2. The weight of a mobile power supply with a total capacity of 20000 mA is about 1kg, so the weight of a mobile power supply with a total capacity of 1.5 mA is about 7 kg. Such a heavy mobile power supply is inconvenient to carry.