My 0.02
In my Helis and Planes I only run Lipos and brushless and have just recently built my first buggy (D4).
The danger with lipos is incorrect charging (Cells Not Balanced), usage (used below 3V/cell) and storage (shorting out, either terminals or internal when cells are damaged).
There is a lot of info in the Aero forums (RCGroups,...)
I vote to keep the weight limit and voltage up to 7.4V nominal.
I am sure over time models will come out to take advantage of the weight distrbution options permitted by lipos.
The Li technology in the new round cells (ABC and others) coming out for power tools seem to be more robust but the V/cell (3.6) is lower than the Li poly gel cells (4.2). These cells are a different size to SubC.
Cheers Jeff
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