What do you recommend that is capable of 1000+ watt seconds out of a single head and runs off of battery power? Elinchrom Ranger RX is currently at the top of my list. Profoto B7 is bigger, heavier and AFAIK no longer in production. I have used it and it is a nice unit. But I think Elinchrome has it beat on price, size and weight. Profoto B1 and B2 are out for being under-powered. I am not interested in solutions which gang together more than one head. Yes, I DO know that watt seconds are not the same from unit to unit, but it gets us in a similar ball park . Main purpose: location portraits. Other uses: events, skateboarders in action, setting up an improvised studio for headshots, 3/4 etc. Do you know of any worthy contenders?