What you whant is high mah ratings on battery packs. that determs run times.
This is what I've thought, but people keep warning me about some of these batteries that they have "misleading" mAh values. I've not found this to be true yet with my 9v Lithium, but I've not begun using it to drive a lux... only the driver, sound, and aux leds... but it seems very happy.
I've just been curious if anyone has tried to investigated these Lithium's and if they are true to the mAh values for reference.