Yaesu FT-817 battery pack - Amateur radio tips and how-to guides
Batteries for QRP radio
Yaesu FT-817 - Wikipedia
Cameron Sino Battery For Vertex/yaesu Ft-817, Ft-817nd - Digital Batteries - AliExpress
Yaesu FT-817: Getting reacquainted with an old friend | Q R P e r
FT-817 Low Cost Lipo Battery | VK3YY
Yaesu FT817ND alternative internal battery option - YouTube
FT-817 Batteries for Air Travel | VK3YY
DYKB Charger Adapter Built in lithium battery Conversion external charging adapter board for YAESU FT 817 FT 818 HAM WLB 817S|Battery Accessories| - AliExpress
WINDCAMP Special Battery Compartment Cover Designed for YAESU FT-818/FT-817 | eBay