[devicenull]

If it's such a problem removing the battery from the robot.. charge it on the robot. I'm sure you can set up some sort of circuit/mechanical device that will disconnect the battery from the RC when you plug the charger into it. Then just mount a battery socket somewhere easily accessible on the robot, and when you get back to the pit, plug the charger into it.

Or, mount a robot battery with this circuit on your cart, and when you put the robot on your cart, plug the charger in. No drained battery during the match, but you also don't have to switch the battery out. Because it doesn't seem to be that much of a load.. you should be able to replace the cart battery once a day, and be fine.

It also seems to me that to use this circuit, you would have to have your robot powered on in the pits.. which doesn't exactly seem like a good idea. No one should be using radio's there, but what if someone has a misconfigured OI, and it manages to link up to your active robot? If you don't have the robot on in the pits, your battery gets charged for what? 3-6 minutes at the most (set up for match, match, clean up from match). And it would be a bad idea to have the robot on in the pits, because, at least from my experience, you are always working on the robot.