Ian, about 7 hours, phantom on. More, phantom off, not sure how much more, though. Daryan, the warmth most definitely does not come from the mme a/d, having run it line-in many times. The sound is night and day. Nearly identical to an ad1000, except a little more resolution, imo. The pre sounds a lot like the mp-2, imo. Round, fat and warm, very forgiving, a little light on the detail.