There may be different configurations here, but on the '67 I am familiar with the RAT will only power the main flight controls through the Center Hydraulic System. So things like flaps, landing gear, brakes and spoilers, although normally (partially) operated from the C Hyd Sys, will not be powered. The HMG, also sitting in the center, will not receive hydraulic pressure either so you are left with BAT power only if both engines spool down.