NP-400 D-LI50 Battery + LED USB Charger for Pentax K10D K20D, Konica Minolta DiMAGE A1, A2, Dynax 5D, 7D, Maxxum 5D, 7 - AliExpress
Pentax K10D Battery and Charger with Car Plug and EU Adapter - Replacement for Pentax D-LI50 Digital Camera Batteries and Chargers (1600mAh, 7.4V, Lithium-Ion) - Walmart.com
Amazon.com: Kastar D-Li50 LTD2 USB Battery Charger Replacement for Pentax D-Li50 Battery, Pentax D-BC50 Charger, Pentax K10, K10D, K10D GP, K10D Grand Prix, K20D Camera : Everything Else