[Al Skierkiewicz]

Alex,
You can easily run servos from the main battery with a handful of 7805 regulators and some 1N4000 diodes. Both are available at Radio Shack. Each 7805 in a TO-220 case can handle 1.5 amps. If you put a diode in series with the common lead on the 7805 it will output 5.6 volts. If you put two in series, the regulator will output 6.2 volts or three will make 6.8. Wire the anode to the regulator and the cathode (the banded end) to the power common. (In the series string, wire the cathode of one diode to the anode of the next in the string.) You could easily make up four of these combos, mount the 7805 on a piece of aluminum to act as a heatsink and distribute as needed. You didn't state what else you may be using the 12 volt battery for, but should it fall below 8 volts, the output of the regulators will drop as well. The last time I bought 7805s at RS they had a schematic on the back. I would put a capacitor near the power input of your regulator group. A 1000mfd@25volts should do nicely also available at RS.