I have a problem with the adapter I have....It will screw onto the batt and it will screw onto the carto, but when it is already attached to one or the other, it will not attach to the counter part...the pin moves....when I have it on the carto, it pushes the batt end pin out and it will not screw all the way onto the batt and vice versa.....chalked it up as a major fail
EDIT: Well...now taking another look at mine, I have fixed it....Godzilla.....see if your issue is the same as mine...will the adapter screw onto the cart when not attached to the batt? If it does watch the center pin on the batt end and see if it moves/pushes out.