D-LI8 Replacement Battery for Pentax Digital Camera (3.7V 550mAh) [Misc.] Pentax Optio Battery Type: Li-ion Volts/AmpH: 3.7V 550mAh It is a replacement designed for Pentax battery D-LI8 This camera battery is compatible with the following Pentax Digital Cameras: Optio S, Optio S4, Optio S4i, Optio S5i, Optio S5n, Optio S5z, Optio SV, Optio Svi,Optio WP, Optio X