2x Pack - Pentax Optio S4 Battery - Replacement for Pentax D-LI8 Digital Camera Battery (750mAh, 3.7V, Lithium-Ion) Replacement Pentax Optio S4 Battery Replacement for Pentax D-LI8 Digital Camera Batteries Quantity: 2, Lifetime Warranty Capacity: 750mAh, Upstart Battery Brand On Sale for a Limited Time!