Amazon.com : Big Mike's D-LI109 Battery for Pentax K-R, K-S1, K-S2, K-30, K-50, K-70, K-500 Digital SLR Camera : Electronics
Amazon.com: BM Premium 2 Pack of D-LI109 Batteries and Battery Charger for Pentax KP, K-R, K-S1, K-S2, K-30, K-50, K-70, K-500 Digital SLR Camera : Electronics
Amazon.com: Synergy Digital Camera Battery, Compatible with Pentax KS2 Digital Camera, (Li-ion, 7.4V, 900mAh) Ultra High Capacity, Replacement for Pentax D-LI109 Battery : Electronics