BOOST OPERATION FOR BATTERY-POWERED PLAYBACK DEVICES

Embodiments disclosed herein include playback devices with power circuitry configured to provide extended playback time by employing a battery boost mode of operation. In some embodiments, boost mode is employed when the battery state of charge (SoC) falls below a first threshold value that is normally associated with battery depletion, and the playback device is subsequently plugged in for charging. Boost mode allows the device to continue operating and providing audio playback for the user for an extended period of time, until the battery SoC falls below a second, lower threshold value. At that point playback ceases and the device is powered down to allow the battery to charge. The device remains powered down until charging raises the SoC to a point that allows operation. Boost mode, however, remains disabled until the SoC rises still further to a third threshold value that is closer to a full SoC.