Abstract: A battery having a universal serial bus (USB) connector is provided. The battery includes a battery control circuit, a voltage regulator circuit, a USB connector, and a device connector. The battery control circuit is used for providing a power source. The voltage regulator circuit is coupled to the battery control circuit, and used for regulating the voltage of the power source. The USB connector is coupled to the battery control circuit, and used for being connected with an external USB device and providing the power for the USB device. The device connector is coupled to the battery control circuit, used for being connected with a portable electronic device and providing the power for the portable electronic device. Therefore, the cost for purchasing subsidiary battery can be saved by using the battery of the present invention. The idea of implementing one battery with multipurpose also fits with economical benefit.