Rare!![MINT w/ 6x7 Bracket] Pentax AF400 T TR Power + AA Battery Pack From JAPAN | eBay
10038 Dual Charger for Pentax GPS RTK BL-200 Battery US EU Plug - AliExpress
Pentax TR Power Pack-3 (AF540FGZ) at KEH Camera
2300mAh NP-F550 NP-F570 Battery Compatible With YN-160 YN-160 II YN-300 YN-300 II | Yongnuo Store
Working on an external power power supply for my Pentax 645. This is the first prototype! Total cost has been less than $20 which is a lot cheaper than buying an external