I recently started building a quadruped robot using the Lynxmotion quadruped body kit and 3DOF SES legs.
For the horizontal joint and 3rd (end) joint, I am using Hitec HS-422 servos, and for the middle (vertical) joint, I am using Hitec HS-635HB servos. I am still waiting for more parts, but I plan to mount onto the chassis an Arduino Mega 2560, an SSC-32 servo controller, one 2800mAh NiMh battery for the servos, and one LiPo 2200mAh battery for the logic boards.
I currently have the robot built with everything except the servo controller and the LiPo battery in place, as I am still waiting for them to arrive. The question that I have is how do I know whether or not the robot will be able to stand once everything is in place? Unpowered, the robot is unable to stand, although it will balance as shown in the image. The battery that I have mounted within the centre of the chassis is quite heavy, which is why I am concerned, and I am yet to add the other battery (and I don't know where to mount it - but that is another problem).
Is it reasonable to expect that these servos will carry a robot with a pair of fairly large batteries and a couple of controller boards?