Lift from the long, flat side, not the shorter side. In this picture, you should lift from the NORTH part of the connector, not the WEST side like they are doing. This is because you can spread the pressure from lifting the connector across more area, as compared to the side. I accidentally broke off part of my battery connector lifting it up the way shown, but was able to do it the way I described without problem. Make sure to lift from the wide part so you don’t have my same trouble!