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I do that all the time, most of the interfaces use very little power so leaving your interface connected will most likely use less power than needed to keep you clock/radio etc powered in standby.
If the car is running with the scanner turned off, it's safe. Some OBD-I scanners require an additional hook up to battery power, OBD-II scanners draw their power from the OBD-II connector. The diagnostic link connector only has power to it with the key in the run or start position. If your OBD-I scanner is connected to a hot at all times circuit (not switched power) there may be a draw on your battery. Some car cigarette lighters are hot at all times, some are switched.
I dont have the same interface - but I am using HPTuners on my carpc for tuning/guages/diagnostics and have found that if the car sits for about 4 days without starting the HPTuners interface will pull the battery down - course then I plan on getting an Optima someday when the current battery dies. I ended up putting a switch in the OBDII power line on my car just in case it is going to sit for awhile - no problem for me during the warmer months with the car sitting much though
Linear Mode
