Well, if your gaming device meets the specs for the game then there shouldn't be a problem. Unless there is something specifically wrong with the laptop the framerate shouldn't be bad and as for having to have it plugged in, if you're running a gaming PC with powerful components then battery life is going to be shorter. Computers with hours and hours of battery life are usually for things like web browsing and word processing, not using high-performance components to run activities requiring a lot of system resources.