Seller promise 2year warranty, Please tell usAny qualityproblems will be replaced new for the buyerby free. Professional Testing All LOSONCOER battery has passed strict quality inspection before shipment: 100% New and O cycle, no memory effect,72 hours aging test, high temperature static, and activate the cell's internal chemical element, ensure the stability of the charging and discharging. So you don't need to activate, charge or use it immediately. LOSONCOER 3600mAh S11-L1-144-2600 Robot Vacuum Battery
