NinjaBatt Battery for Dell MR90Y XCMRD Inspiron 3521 15-3521 15R-5537 15-3531 15R-5521 15-3537 15-3542 17-3721 17R-5721 3531 5421 Latitude 3440 3540 312-1387 4DMNG V8VNT FW1MN - 6 Cells/4400mAh