Black Friday 12.4 hours of mixed use (4850 + DBMD4 DSP) Battery, All‑day battery life, up to 18 hours of normal use,Up to 36 hours in Low Power Mode 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