Sold as a Set of 2 batteries which are required for the Optima II, Solo II, Viso II+, Protrack II and Quattro.
Lithium 3-volt, CR2325.
Replacement batteries for Optima, Optima II, Solo, Solo II, Viso, Viso II, Viso II+, Protrack II and Quattro only. Sold as a Set of 2 batteries.