Some of the prefilled come with little "pins" inserted in the battery end, others come wrapped in a wrapper, others come in different packaging. I have several pkgs. that seem old and partially empty on arrival. They are the ones in seperate clear packages within the box. You have to rip open the wrapping to get to the cart and then pull of the condoms which do not have the "pin". Is this a different manufacturer.
I have not had this issue with the WOWS.
I have not had this issue with the WOWS.