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Originally Posted by Matt Krass
We do exactly that, we have a box with 8 AAs and a switch that connects to the main, that powers the controller and radio/tether and the backup battery powers servos (and EDU motors) as well as the Camera.
Keep in mind it won't last terribly long in that mode though, so keep a few backup batteries ready.
Also if the "Main" (The AAs) get low the backups die even faster. It would help to get your hands on a Vex battery kit for this, or even a Vex kit, not sure if the controller can interface to the camera though.
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Last year when I was developing camera code for a final project I used an old 12v power supply from a broken router to power the RC and connected the camera like you would have it on actual bot. This worked well and allowed for unlimited testing without a bot at my disposal (hard to transport a bot back and forth to school).