[Jeff Rodriguez]

Two of our batteries have issues similar to this.
We put the battery in the robot, switched it on, and nothing happened. The robot didn't go on at all. We disconnected the Anderson connector and connected a different battery without actually moving the first one, switched it on and it was fine.
I think it was the battery, but after reading the thread I now suspect the Anderson connector as well. It has happened to us only a few times and each time, we haven't done a thorough investigation of the problem.
I believe we have a mix of new and old Anderson connectors on the batteries (we taken them off old, dead ones).