Do they have the battery monitor for a 2 pack setup? That would be awesome on my Monster GT. I wonder it it provides real time readings too, so if you nail the throttle, you can see your voltage drop?
All it does is plug into the balance port of the lipo. If you have multiple packs, just get a converter plug that takes you 2- 2s lipos and makes 1 4s lipo plug. Its quite simple to make as well.