D-DC128 DC Coupler for Pentax K-30 K-50 K-S1 K-500 K30 K50 KS1 K500 634563529052 | eBay
Original Replacement Battery D-li109 For Pentax K30 K50 K70 K500 Kr Ks2 Ks1 K-30 K-50 K-70 K-500 K-r K-s2 K-s1 1050mah - Mobile Phone Batteries - AliExpress
Amazon.com : Pack of 2 D-LI109 Batteries and Battery Charger for Pentax K-R, K-S1, K-S2, K-30, K-50, K-70, K-500 Digital SLR Digital Camera : Electronics