The packs are wired in series for 8s 2500mah. You can also see the pics here:
http://picasaweb.google.de/Brushless...xxasRevoSetup2
The red chassis is really nice, i bought the Revo as a roller from skellyo before Christmas. I'll make a small video soon, but here in Germany it is raining since yesterday evening....
The Kontronik/Tunigy combo is really cheap but working so great that i'm thinking about buying a CRT.5 and convert it also using a Turnigy Outrunner and a Kontronik ESC. I've never had a setup that ran that smooth.