You should build a VV, I built the evercool mod found here in the forums and I used that 4.8v NiMH with it. For me I rarely vaped it at over 4.6v with a 2ohm DCT. It was awesomeness but the battery did tend to drop off after a bit. I just got some IMR 18350's for the VV, that should work. If you do decide to build the evercool, the regulator can be ordered as a sample from TI...it helps keep the cost down.
Ron -