Coolgo&reg; New Laptop Battery 6cell for Acer AS10D31 AS10D3E AS10D41 AS10D51 AS10D61 AS10D71 AS10D73 Aspire 4551 4741 5741 7741 7551 TravelMate 7740 - 18 Months Warranty [li-ion 6-cell 5200mAh 10.8V] 6Cells Acer Aspire 4551 4741 5551 5741 7741 7551 TravelMate 7740 8472 10.8V 5200mAh Black replacement. Quality Certication: All the products pass the ISO9001, CE and ROHS, FCC multiple international authentication and completely accord with environmental protection requirement. Consummate Design: Excellent design makes the product not only has the overcharge, discharge and short circuit multiple protection, but also to balance charge-discharge of all the internal cells. Environmental Test: Standard modern assembly line. All products have passed a variety of charge-discharge and aging test before they leave the factory. 100% quality test for all items. Free shipping via USPS first class package from USA, 24 x 7 Email Support. Brand new direct from Professional Manufacturer, 18 Months warranty!