US Patent 10114605 Group coordinator selection

A network device is arranged to identify a group coordinator for a group of networked playback devices. The network device may have a network interface configured to communicate with first playback device and a second playback device over a network. A processor may execute instructions to cause the processor to receive a command to cause a group of one or more playback devices to play audio content, wherein the group of one or more playback devices comprises the first playback device. In response to the command, the processor is to determine that the first playback device is battery-powered. The processor is to identify the second playback device to provide audio content data and audio content playback timing information to the group of the one or more playback devices based on the determination that the first playback device is battery-powered.