Amazon.com : Wasabi Power Battery (2-Pack) and Dual USB Charger for Pentax D-LI90 and Pentax 645D, 645Z, K-01, K-1, K-1 II, K-3, K-3 Mark III, K-5, K-5 II, K-5 IIs, K-7 :
D-LI106 Battery 1150mAh Camera Batterie For PENTAX X90 MX-1 - AliExpress
Pentax battery holder D-BH109 - Photospecialist
Amazon.com : BIG MIKE'S ELECTRONICS D-LI109 Battery for Pentax K-R, K-S1, K-S2, K-30, K-50, K-70, K-500 Digital SLR Camera : Electronics
Rechargeable L-Ion Battery D-LI90 for Pentax DSLR cameras – PENTAX - Official Store