I haven't tried applying more than 6v to my system, but i think it has more to do with epa being set to not overload the servos. I say this because i had the bec fail in my MMM once and sent full 3S 11.1v to my steering servo. It was FAST but did no damage. I didn't run it long but i did for a minute or two. After that i used the servo for a long time to come until i upgraded. It was a chaep servo and it survived 11.1V. Keep in mind I had my epa set properly. Hope this helps.