Just in case any of you (us) big-charger fanboys haven't noticed, there is a new model coming to the well-regarded iCharger lineup. The 4010Duo has input voltage and current limits of 50V DC and 65A and output capabilities of 40A per channel (70A in synchronous mode) or 1600W per channel (3200W in synchronous mode.) As indicated by the "Duo" in the title as well as the "synchronous mode" referenced above, this is a native two-battery charger.
You can view the specs here: http://www.progressiverc.com/icharger-4010duo.html, but suffice it to say that it probably can charge any RC battery you have or that can be dreamed up in the foreseeable future.
Available December 1 (estimated) for about $350 + s/h & tax.
Now to find a PSU that can feed this animal...