NotNodi® Pen Assembly
Click here for the VIDEO on how to di-assemble & re-assemble the Pen to replace the batteries and ink cartridge.
INK REFILL: 67mm Metal CROSS (1.0mm)
BATTERY: Four (4) x LR626 Battery Alkaline 1.5V
AG4, LR626 and LR66 are alkaline button batteries with identical dimensions and specs. They are a very common button battery used for consumer electronics and are not rechargeable.