2 Hours (Alkaline, 4 Channels, 62-Ohm Load, Backlit Display, Phantom Off, Recording, Stamina Mode/Battery Save) 3.5 Hours (NiMH, 4 Channels, 62-Ohm Load, Backlit Display, Phantom Off, Recording, Stamina Mode/Battery Save) 6.5 Hours (Lithium, 4 Channels, 62-Ohm Load, Backlit Display, Phantom Off, Recording, Stamina Mode/Battery Save)