I had a question regarding rule R13 - “Electrical power comes from VEX batteries only.” Though this wouldn’t be super practical, would you be able to have a second VEX battery, or even a non-VEX battery, charging the one used to power the brain? Again, I don’t think I would actually try this in a competition, but I am curious about what qualifies as powering the brain. 
You read the Game Manual - only One (1) Battery on the robot.
You would need to modify electronics on brain or battery to get two batteries connected and that is not permitted.
Please mark as solution.
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Fair enough, guess I should’ve read harder!
Actually, you did great! Most would not have cited the relevant rule, and to be fair, I did not cite the rule about modifying electronics specifically. I did have to infer competition context, thus illegal and in practice could be a safety issue.
I like the idea about how to augment capacity of power system, it used to be a thing back with Cortex system with “Power Expander” allowing to connect two NiMH batteries together. With V5 it is not so simple as the V5 Brain communicates to the battery via the battery cable. I do not know if you can put batteries in parallel and have V5 brain communicate to two V5 Batteries. For safety reasons, I would not randomly experiment with V5 Battery system. Good thought experiment, but in practice could yield catastrophic results due to the chemistry with Lithium based batteries.
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Yeah, I wasn’t planning on doing that, I was just curious about the rules regarding it. In practice I have multiple batteries I can charge instead of trying to connect several.
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