D-LI109 Battery for Pentax K-R K-30 K-50 K-500 Digital SLR Camera + More!! : Amazon.in: Electronics
Pentax K-50 Battery Replacement
Original Replacement Camera 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
Pentax K-50 - Wikipedia
ヤフオク! - 118 【2個セット】PENTAXペンタックスD-LI109互...
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