From what I have heard, the ryobi uses about 12 oz of fuel per hour at 7000 RPM. It doesn't take much fuel to outweigh the magneto. I hadn't looked at Li-Ion, though that is a simple possibility. I do have an Orbit Microloader that would charge them. And timing off the cam sounds like it could work, and would cut consumption by almost half. I'm already going to have significant battery load for the RX to last that long. Thanks for the idea.