Amazon.com: BM Premium D-LI109 Battery and Battery Charger for Pentax KP, K-R, K-S1, K-S2, K-30, K-50, K-70, K-500 Digital SLR Camera : Electronics
Pentax KP with Battery Grip D-BG7 - PentaxForums.com
New PENTAX D-BG7 Battery Grip for KP Digital Camera | eBay
Amazon.com : BM Premium 2 Pack of D-LI109 Batteries and USB Dual Battery Charger for Pentax KP, K-R, K-S1, K-S2, K-30, K-50, K-70, K-500 Digital SLR Camera : Electronics
Tempted to get a KP, need advice: Pentax SLR Talk Forum: Digital Photography Review
Pentax D-BG7 Battery Grip for Pentax KP (Uses 1x D-Li109) at KEH Camera