Yeah, I had the same problem with my gas unit — it ran out of gas when almost done (I only fill half tank as I don't like a lot of gas left in the tank when done.) I had to get my gas can, pour in some gas, and start it again to finish. Didn't bother with the electric start as when the unit is hot, a couple of pushes with my thumb on the fuel primer bulb, single pull w/o choke and off and running again.
Don't get me wrong — I believe in using batteries but only for specific purposes, e.g.my electric tooth brush, wireless mouse, smoke & CO2 alarms, cell phone, battery to start my car's gas engine.