I think I saw some updated Orion Sanyo 3600 at the LHS (In US) 460+ run time, with 1.180 voltage. I thought original 3600s had low voltage around 1.14x? and high IR? these had 3.0ohms, which compared to Orion 3300SP2 packs, the run time was higher, but little down on the voltage and similar IR. With killer run time like that, its discharge curve for voltage should be higher then 3300s? Only problem is, they're priced at $80 a pack! ouch. Might pick one up to see how it compares to my new GP3000 packs.