use of 4S or 5S vs using 6S

[crazyjr]

The only real reason for running 4s on a setup, is really if you only want a certian power or you are limited by rules. For instance, RC Pro allows electric to run with nitro in Nitro MT, but they are limited to 4s power. I am limited to 5s by esc's myself, I have a quark 125/Neu 1515/2.5d in my G2R and a quark 80/lehner basic xl 1200 in my RC 10GT conversion. The quarks are rated for 6s, but they are finiky on a fresh charge, why risk it. I want a few MMM's to go 6s though and get away from UBEC's.