High Performance MR90Y Battery for Dell Inspiron 14 3421 14R 5421 5437 15 3521 15R 5521 5537 17 3721 17R 5721 Latitude 3440 3540-2 Years Warranty 100% New Battery from Manufacturer. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Quality of our battery as good as GENUINE Dell Inspiron laptop battery Battery Compatible with Laptop Models: Dell Inspiron 14 (3421), 14R (5421), 14R (5437),15 (3521),15R (5521), 15R (5537), 17 (3721), 17 (3737), 17R (5721), 17R (5737), Dell Latitude 3440 3540 Battery Compatible Battery Part Numbers: Dell type G019Y 0MF69 6HY59 4DMNG 8RT13 8TT5W 68DTP 6XH00 9K1VP VR7HM V1YJ7 W6XNM 312-1390 6K73M Operation Time: Using updated battery cell. Thousands of customers's recommend great price for around 4 hours chargering time. Rechargeable up to 800 times over life of batteries. Certified by CE, FCC, RoHS, Warranty: 24 Months warranty. Assistance: Email reply within 24 hours, 7 days a week.