This case is designed as the appearance design of several charging treasures. The built-in battery core adopts 21700 ternary lithium power battery with higher energy density. With the same volume, it has higher capacity and faster charging and discharging speed. At the same time, it can be more widely applied to various outdoor environments. At the same time, it has its own plug and can be plugged into the socket for charging at any time, which is convenient and fast.