I am also a big fan of 6s systems... pity some races still require 4s. That is why I have 2 of the same rig, one is 6s one is 4s. Smaller batteries for 6s (5000mah is way overkill)... and DO NOT RUN TILL DEAD. I have several 6s 2600 mah hard case packs that are about 3 years old and still work great!