Amazon.com: Kastar 1-Pack CR-V3 Battery and LTD2 USB Charger Replacement for Pentax Optio 43WR, Optio 540, Optio S30, Optio S40, Optio S60, K100D Digital SLR, K110D Digital SLR, Ricoh Caplio RR330 :
Pentax k100d repair($30 thrift store find) - YouTube
4x AA 2600mAh Pentax Camera Battery
Kastar CR-V3 Battery 1-Pack Replacement for Pentax Optio 540, Optio S30, Optio S40, Optio S60, K100D Digital SLR, K110D Digital SLR Camera, Ricoh Caplio RR330 Camera, Nikon CoolPix 2100 Camera - Walmart.com
Amazon.com : PENTAX Battery Grip D-BG8 Black for Pentax K-3 III Flagship DSLR Dust-Proof and Weather Resistant Construction with Capacity to Hold Additional D-LI90 Battery (37048) : Electronics