Amazon.com : YN SF-17 Flash Battery Pack for Canon Flash 580EXII 580EX 550EX : Digital Camera Accessory Kits : Electronics
Synergy Digital Camera Battery, Compatible with Yongnuo YN-600 AIR PRO LED 5500K CRI 9 Digital Camera, (Li-ion, 7.4V, 4400mAh) Ultra High Capacity, Replacement for ATOMOS Battery - Walmart.com
Say goodbye to proprietary batteries: Yongnuo YN560Li (hands-on) - Lighting Rumours
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 battery pack SF-17 for Canon
JJC CP-E4 Flash Battery Pack for Canon 600EX II-RT 550 580EX II YONGNUO YN-560II 6950291536518 | eBay