i have converted 3 of my KO helios to lipo 3s now no apparent issues
there are some thoughts that it may overload the regulator and burn it out .I think this could be an isue with prolonged use but for 5 min racing i dont have any problems
long rallycross or bashing users may have problems in the old days i remember some people stuffing an extra cell up an ko mars for 9 cells which when fully charged gave easily the same voltage as a lipo
worse problems are when messing about witx Tx and forgetting to extend aerial and overheating RF module
regards dave