Maxamps 8000. The run time is insane. I use a BL 6.5 and have plenty of juice left
over after 20 minute runs. It could probably do 30 - 45 minute enduro runs if geared appropriately.
Even though the 8000 weighs about the same as an IB3800 pack, it does
raise the trucks cg a little bit. Not a lot, but just enough to notice.