I've run 12th with LiPo and single cell voltage. It's really not a big deal to set up. You do need a receiver pack but that's the only thing that you really need to add.

With 12 450mAh cells you can run a 3.5BL hard and make time. Stock and 13.5 are slower than 4 cell but not that bad. Switched off between the LiPo and NiMh at the track.

I picked up two maxamps receiver packs and wired them in parallel. Best part was that they can be built as a saddle pack to fit in my CEFX car.