Funny thing is, i don't really find myself in many situations that have me on my transportable rig for more than 4 hours in a stretch. So i couldn't say what the total run time on my iMod is. As for rockbox on it, it does seem to suck more power then the regular firmware though. Guess it's time to splice a dock connector end to my old battery rig for the old M3 of mine. 40,000 mAh of battry power.

Got me across the continental US. Amp ran out first though.