You can connect 7,4v batteries direct to the CB200 without any regulator,
so your complete system is up to 7,4v. CB 200 has no regulator inside.
I have maybe 25 brand new Hitec 7955TG Servos which i use in this plane,
thats why I use the MaxBec 2d plus.
The small piece left from CB200 which looks like a Rsat is a Jeti rc-switch.
regards Steven