[Al Skierkiewicz]

Greg,
The 100 amp is fine. Remember the breaker is there to protect the battery from high current loads. Be sure to use the wiring specifications for size as listed in the robot manual and you should be fine. If you are going to use smaller wire, then you may need to go to a smaller circuit breaker.
The 60 amp breaker used in previous years was specially designed and rated for 48 volt DC operation so any old 60 amp breaker would not function the same.
The Anderson connectors work OK if they are propoerly terminated and are not damaged when inserted into the plastic block. A misaligned terminal causes a high resistance connection. High resistance and high current result in heating of the contacts and early failure. I just listed MCM as a source because I saw the connectors while paging through the catalog.