The capacity of most portable batteries on the market, as a rule, does not exceed 10,000 milliamp-hours – this is enough to charge a smartphone 2-3 times. However, for those who think this is not enough, China has created an external battery of 270,000,000 mAh. As the craftsman under the nickname Manual Geng said on social networks, the giant power bank he created allows you to charge 5,000 smartphones with 3000 mAh batteries. Up to 60 chargers can be connected to it at the same time, writes Gizchina. Moreover, not only smartphones, but also almost any other electronics can be...