Egoway 6Cell High Performance New Laptop Battery for Dell Inspiron 14 14R 3421 5421 5437, 15 15R 3521 5521 5537, 17 17R 3721 3737 5721 5737, Latitude 3440 3540, Vostro 2421 2521 - 12 Months Warranty [Li-ion 11.1V 4400mAh] Battery Type: Li-ion; Voltage: 11.1V; Capacity: 4400mAh; 6 Cell. 100% New from Manufacturer; High Performance N3421 3521 Replacement Battery. Overcharger and Discharger Circuit Protection; CE-/FCC-/RoHS-Certified for safety. Contain with Durable cells; Low power consumption IC design; Tested with strict quality control standards; Direct warranty from Manufacturer. Warranty: 12 Months Warranty, 30 days money return guarantee; 24 x 7 email support.