Found this a few days ago browsing along HPI's European site. Looks like HPI has updated the manuals documentation with more specific detail in regards to the type and kind of batteries to be safely used in the Savage Flux. Also note that they are stating to be sure to DISCONNECT your Lipo's from the ESC, even with the power switch off to prevent damage from overdischarging. A good move.
Just thought i'd pass it along for those who have the older manuals and as a general FYI
http://www.hpieurope.com/manuals/upd...ate_060309.pdf