My big issue with the RE battery cable terminals are that they mount on the side of the battery posts, and on the back side at that. All my other bikes have had battery cables that attached to the TOP of the battery. So when I installed my ne MotoBatt battery, I partially replaced the battery cables, and used new connectors that mount to the top of the battery. I also installed a battery tender pigtail. I made sure that the cables were plenty loose, so there would be no stress on the connectors. I have never had a battery connector break on any bike, including the Enfield, but after reading all about it here, and having a problem with the connectors connecting to the back side of the battery, where they were almost impossible to get to, I converted them over to the more normal position. If you were using a Harbor Freight battery tender, that may have been the reason it broke. I use Deltran Battery Tender JR.s. Even they have an issue. The screw hole in the connector is to big, making the connector too thin. I use a washer on top of the connector to make sure they are secured properly. Metallurgy has a LOT to do with how metals behave. A brittle metal will crack from vibration, while a more malleable metal won't.