FT-817 Batteries for Air Travel - Resource Detail - The DXZone.com
FNB-72eXX: 9.6v 2550mAh eneloop battery for Yaesu FT-817 — Batteries America
DYKB Charger Adapter Built in lithium battery Conversion external charging adapter board for YAESU FT 817 FT 818 HAM WLB 817S|Battery Accessories| - AliExpress
Batteries for QRP radio
Yaesu FT-817 - Wikipedia
Internal FT-817 NiMH battery option | waynemerry
How to charge Yaesu FT817ND internal battery - YouTube
The Original] Yaesu FT-817 & FT-818 2450mh Battery Upgrade using IKEA LADDA Japan Made Cells - YouTube