MT2070 powering up after dead battery indication


I am able to duplicate this issue.  The MT2070's battery is drained until the unit doesn't power on.  I attach the RS232 cable with the power supply attached, the unit still doesn't power on.  I leave the cable connected for 10 minutes, press the trigger to turn it on.  The unit doesn't power on.  I must disconnect the cable, remove the battery and do a cold boot.  This is the only way that I can get the unit back on after the battery is dead. I need to know if this is by design.  I would hope that the battery would turn the unit on once it received enough charge, I am not seeing that.