Black Friday Continuous music playback time: Max. 30 hours(NC ON), Max. 40 hours(NC OFF) Continuous communication time: Max. 24 hours(NC ON), Max. 28 hours(NC OFF) Battery, Multi-day battery life, up to 36 hours of normal use, Up to 72 hours in Low Power Mode Battery, up to 18 hours of normal use, up to 36 hours in Low Power Mode Battery