According to one embodiment, an electronic apparatus includes a speaker, a terminal, an amplifier, a battery, a power supply circuit, and a controller. The terminal is configured to input an audio signal from an external device. The amplifier is configured to amplify the audio signal which is input from the terminal, and to output audio from the speaker. The power supply circuit is configured to supply power from the battery to the amplifier. The controller is configured to control the power supply circuit, based on a residual capacity of the battery and a preset battery level, in order to supply the power to the amplifier when the electronic apparatus is in a non-operative state.