CR2032 Button Cell Battery

A standard CR2032 coin cell, the same 3V lithium button battery used to power the illuminated reticle in a number of the replica optic sights sold here. If your optic's dot has dimmed or stopped lighting up entirely, a dead CR2032 is the first thing to check before assuming the sight itself has failed — it's a cheap, five-minute fix rather than a warranty case.

Worth keeping a spare or two in your range bag alongside your darts or gels, since a dead button cell mid-game means shooting blind on a dot sight until it's swapped. Fitment is a simple drop-in replacement in the battery compartment on the underside or side of most compact optics — no tools beyond a small coin or flathead needed to open the cap on most models.