well electronics you use in the RC scales vary bigger RC's the costs for parts can go up dramatically.
Like I can run a $60 Brushless motor, and ESC combo in my tamiya DF-02(1/10th scale) but my savage (1/8th scale) has a $200 BL and motor combo

your current batteries would only be able to power as foxy said a 1/16th scale or maybe a light 1/10th scale with a low end BL setup. And fitting the batteries might be an issue in the smaller setups.

Plus yea savages are like those girls on talk shows like jerry springer, you can beat them all you want, and they keep coming back for more.