I have the brushless gimbal and controller (Martinez) from RCTimer. The gimbal is controlled by its own 1800mah 3S Lipo. I would like to be able to control the gimbal's pitch, so I connected a servo cable going from Ch. 7 on my Rx to the appropriate input pins on the gimbal controller. When I powered the gimbal, I was surprised to see that it also powered the APM. Naturally, not being an electrical engineer, that made me hesitant to connect the primary Lipo that usually powers the APM.
Am I missing something? Would it be safe to have both batteries connected at the same time if both appear to be providing power to the APM? If not, how do I connect my gimbal to my Rx without it also powering the APM?
edit: FWIW, I do have the APM power module piece between the APM and the primary Lipo, but I don't think that that would somehow make it "okay" to have two sources seemingly providing power to the APM.