I made this pack last week... dremeled a slot for the wire to come out from (soldered onto the lead springs inside), and I just used a Deans connector because that's the one that was on the pack in the first place. I also am running a 2s M1 receiver pack as well(I don't trust BEC's for racing), but I would like to get something lighter...
It's a 4s A123 pack, if you couldn't figure it out. Runs at 12.7 volts for the entire runtime, of which is over 24 hours! I have alot more range as well, about 1/3 mile now.
Although I would like to get some 18650 A123 cells for lighter weight, but it's not bad, it makes it stable i guess for at the track.
HERE you can get the G3 LiFe receiver packs, they are brand new, just became available two days ago.