I am in the market for a couple of battery powered mono lights, the Profoto B1 meets all the specs except price. I have used Dynalite equipment since 1980, and their new Bajas are very appealing. The recycle time unfortunately is almost 4 seconds on full power, which is too long for people photography.
The B4 is rated at 400 W/S, and the B6 at 600 W/S, although there are reports that the B6 is actually a stop brighter than the B4. Could someone who has used the B6 comment on recycle time when dialed down 1/2 and 1 stop? The B6 may provide a sufficient combination of output and recycle time, at the cost of a bit more bulk and weight.
Rumours are that Hensel has a similar unit in the works, but no announcement yet, It seems plausible that Elinchrom would be thinking of this too. While the Quadra is well regarded, it still involves connecting a cable and hanging the pack on the light stand. I find the concept of a self contained light which can be quickly set up very appealing.