They are not intended for use with black plastic cuvette holders. The tip spacing is 18.65 mm. You need 2cm centers for the cuvette holders. But they will work to glue the cells together.
Pros
SOLDERING AND WELDING: Leads can be used to weld and solder various types of batteries such as NiCd, NiMH, AA, 18650 and Tenergy batteries.