I don't think those motors are suitable. The standard for featherweights would be something that completes with http://ranglebox.com/product/saturn-...etary-gearbox/ mated with this http://ranglebox.com/product/775-18v-motor/. The Saturn 16 & RS-775 combo has approx 1375rpm at 8.5Nm of stall torque. The motor you've mentioned is 330rpm at 0.025Nm stall torque.

Typical batteries are 5s (18.5V nominal, 21V fully charged) lithium polymer packs from hobbyking or OptiPower.

My normal recommendation is to come along to an event and check out what other people have done. Unfortunately there will be a bit of silence at the moment as everyone collectively panics about RobotWars. Your best bet is to read through the build diaries.