Quote Originally Posted by RogueTwoRobots View Post
Running two separate packs for drive and weapon is a common approach, but usually for larger voltage differences. Running a 5s for drive and 6s for weapon seems a little pointless (5s fully charged is 21V). Running on a single 6s pack would be more logical and just put dual rates on if you want to limit the voltage on the drive motors.
Point taken, I didn't consider dual rates. I've just tracked down a 5000mah 6s that should be plenty for any drive/weapon combo, and still weight 400g less than the 2 separate batteries.

By the way, how long is the axe on Onyx? Mine would be 35cm from axle to tip, geared 5:1 ratio, and I just want to be sure whether that's adequate for self-righting.