There are a few battery-powered models but they are not practical at this time. The motor powering the pump requires too much power for them to be feasible. The one we have tested is a Ryobi cordless battery powered with space for 2x 5Ah, 36V batteries. Each battery lasted 12 minutes of pressure washing. And that was light-duty cleaning power 1,400 PSI and 1.3 GPM. Although it was a pleasure to use – very quiet and smooth. Read more here.