AC Doctor INC FK890 UW280 FP282 GK479 Extended Battery 7800mAh for Dell Laptop Inspiron 1520 1521 1720 1721 Vostro 1500 1700 9 Cell 7800mAh Replacement extended battery for Dell Inspiron 1520 1521 1720 1721 530s Vostro 1500, Vostro 1700 laptop 11.1V 7800mAh black 209.90x69.80x20.40mm 446.8g. 10.8V and 11.1V is compatible, 14.4V and 14.8V is also compatible. Full compatible with your original battery, brand new direct from Professional Manufacturer. CE UL RoHS certified, safe use. 60 days no worry to return or exchange item, 12 months customer service warranty. US local dispatch. Please Note: Please make sure that the product shape of slot and gap are the same size. The battery part numbers listed in the description matches the battery part number on your original battery before you purchase.