Synergy Digital Vacuum Cleaner Battery, Compatible with Electrolux ErgoRapido ZB3104 Vacuum Cleaner, (Li-ion, 14.4V, 2500mAh) Ultra High Capacity, Replacement for AEG 140026702013 Battery - Walmart.com
AEG AG901 Ergorapido replacing the batteries - iFixit Repair Guide
Best Buy: Electrolux Ergorapido LiTHIUM ION Brushroll Clean Xtra Bagless Cordless 2-in-1 Handheld/Stick Vacuum Watermelon Red EL2081A