During production of the Lancer, some of the plastic enclosures had a piece reversed, which had no effect on batteries made in Asia. The Asian batteries have longer contact points and made the connection each time.
On some batteries made in the US and Europe the reversed piece does not allow for the batteries to make the connection. They have already developed a solution (a small thin metal plate, with instruction sheet) and we will gladly mail the metal plate to anyone with issues. NECA apologizes for any inconvenience.
Please email them your name and mailing address to firstname.lastname@example.org if you are encountering this problem.