I hadn't run my Radix6 for several months, and I decided to get it out for a good run in the dirt yesterday. I recently found two 4s batteries I forgot I had (I bought them for other vehicles), and I put a 4s battery in my Radix6 rather than my normal 6s. Given the small dirt area behind my house that I run my RC vehicles in (pic below), the Radix was perfect on 4s. I think I'm going to run the Radix on 4s most of the time with an occasional run on 6s.