I know I raised this about a year ago when the sp4 first came out, not sure there was ever any clear position, so wondering after a year if opinions have changed. I leave my SP4 plugged in 24/7 and use it intermittently every day while plugged in. I unplug it intermittently for short periods of time - lets say 30-60 minutes a few times a week and then maybe 1 or twice a month take it with me traveling where its unplugged for a few hours. Should I let it run down more often?