Black Friday 4-cell, up to 8.5 hours Battery, 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, Maximum music play time with ANC off (hours) 65 Maximum music play time with ANC on (hours) 50 Maximum play time (hours) 65 Maximum talk time (hours) 33 Battery