Speicifications: Chemistry: Li-ion Brand: For Eufy / Ecovacs Model No.: TW4-11 Condition: Brand new Sub-Type: Replacement Battery Capacity: 4000mAh/4.0Ah Voltage: 14.4V Item Weight: 280g Compatible Model: For Ecovacs Deebot N79, For Deebot N79S, For Deebot DN622, For Deebot DN621, For Eufy RoboVac 11, For RoboVac 11S, For RoboVac 11S MAX, For RoboVac 15T, For RoboVac 30, For RoboVac 30C Max, For RoboVac 15C, For RoboVac 15C MAX, For RoboVac 12, For RoboVac 35C. Package Included: 1X Battery.