According to an embodiment, there is provided a printer including a plurality of printing modes. A first printing mode is a printing mode for discharging a label (X1) by a transfer device, the label (X1) being still attached to a backing sheet (X0). A second printing mode is a printing mode for discharging the label (X1) by the transfer device while peeling off the label (X1) from the backing sheet (X0). The printer controls power supply from a storage battery such that a printing device (141) performs printing at a second printing speed when the printing mode is the second printing mode and such that the printing device (141) performs the printing at a first printing speed when the printing mode is the first printing mode, the first printing speed being faster than the second printing speed.