Yongnuo SF-18 Compact Battery Pack with AA Battery Holder (for use with Select Flash Units) at KEH Camera
YONGNUO External Flash Battery Pack Cell Box SF 18 for YONGNUO YN 565EX II YN 560 II,YN 560 III,for Canon 580EX II 550EX 540EX|box si|box ps2box flute - AliExpress
Yongnuo Flash Battery Pack SF 18 SF-18C SF18C for Canon | Yongnuo Store
Yongnuo YN560 Li Lithium Battery Power Supply Flash Speedlite for Cano – JG Superstore
Yongnuo Sf-18 Flash Battery Pack For C 580ex 550ex Yongnuo Yn-560 Yn-565 - Flashes - AliExpress
Powering a Yongnuo speedlite from a SLA battery [DIY] - YouTube
USED] YongNuo SF-18 External Flash Battery Pack for Nikon (Excellent in Box!) - SOLD - ShaShinKi