D-BC109 K-BC109 Charger for Pentax Pentax D-Li109 Batteries
First Impressions: Pentax K-50 - The Phoblographer
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Pentax K-50 review
For Pentax K-R KR-50 K-500 K-30 Camera D-BH109 Battery Holder AA Battery Holder | eBay
Amazon.com : HQRP AA Battery Holder-Adapter Compatible with Pentax D-BH109 K-r K-30 K-50 K-500 Digital SLR Camera 39100 Replacement : Digital Camera Battery Grips : Electronics
For Sale - Sold Pentax K50 K-50 digital camera body only w/AA battery holder, Low shutter count - PentaxForums.com