Synergy Digital Vacuum Cleaner Battery, Works with Eufy RoboVac 11 Vacuum Cleaner, (Li-ion, 14.8V, 2600mAh) Ultra High Capacity, Compatible with Eufy 0 Battery - Walmart.com
14.4V 4000mAh TW4-11 Replacement Battery for Eufy RoboVac 11 11S MAX 30 15T 35C - Walmart.com