In the box that my EFILIVE V2 came in was a card saying NOT to power your laptop from an inverter while the V2 is connected, doing so will damage the 2 units. What about powering the laptop from the A/C adapter plugged into my garage? Or should I only use batery power from the laptop to powe it? The reason I ask is that the laptop I'm using slows WAY down when on battery power, and the screen on it dims to save battery to the point that I can't hardly see it during the day.