?Replace Part Number?0MF69 MR90Y N121Y G35K4 MK1R0 YGMTN ?Compatible Models?Dell Inspiron 14 (3421), 14R (5421), 14R (5437),15 (3521),15R (5521), 15R (5537), 17 (3721), 17 (3737), 17R (5721), 17R (5737) ?Security?Overcharge and Discharge Circuit Protection, All products are CE Certified for safety,Strict guidelines for compatibility, and standards compliance for environment safety. 100% New from Manufacturer, About 500 recharge cycles over the life of the battery. ?BUY WITH CONFIDENCE?12 months warranty; 24 x 7 email support.