The utility model relates to the field of lithium ion batteries and discloses a power lithium ion battery. The power lithium ion battery comprises a shell, at least two LEDs (Light-Emitting Diodes), an LED circuit board, a lithium ion battery pack and a direct current-to-direct current voltage reduction switching circuit, wherein at least two LED lamps are enchased on the head of the shell; the lithium ion battery pack is packaged in the shell; each LED lamp is fixed on the LED circuit board and extends out of a hole position on the shell; the direct-current input end of the direct current-to-direct current power supply switching circuit is connected with an output end circuit of the lithium ion battery pack; and the direct-current output end of the direct current-to-direct current power supply switching circuit is connected with an input circuit of the LED circuit board. The power lithium ion battery is more attractive and elegant in structure, has high warning performance, and is benefit for improving the safety of the power lithium ion battery in application.