The rock has a standard 510 connection (inside threads) and what looks to be regular ego threads on the outside, so just about anything with a 510 thread and a resistance above 1.5-1.7 ohms should work fine.
it usually not advisable to use very low resistance with a standard ego style battery as they do not have the amperage capabilities to power them correctly.
as for rebuildables except for the size of some of them, as long as you keep the resistance up I do not see why they would not work.
I personally used to run standard egos in the 1.8 to 2 ohm range.