Kastar D-Li109 Battery (2-Pack) for Pentax D-Li109, DLI109 work with Pentax K-R, K-30, K-50, K-500, KR, K30, K50, K500 Cameras - Pentax - Camera & Camcorder - Battery & Charger - Products
Original Replacement Camera Battery 1050mAh 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|Mobile Phone Batteries| - AliExpress
2x 1100mAh Pentax Camera Battery D-Li109
Pentax D-Li109 DLi109 Camera Battery for Kr K2 KS1 KS2 K30 K50 K500 K-2 Camera | eBay
Battery wrongly stuck in Pentax K-50 - PentaxForums.com