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
Original PENTAX D-BC109 Charger DBC109 For K50 K500 K-r K30 D-LI109 Battery | eBay
Battery wrongly stuck in Pentax K-50 - PentaxForums.com
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
Pentax K-50 - Wikipedia
PENTAX APS-C Accessory | Rechargeable L-Ion Battery D-LI109€ – PENTAX - Official Store