Laptop Battery 40Wh Laptop Replacement Battery for DELL Inspiron 3421 5421 3521 5521 3721 15-3521 Notebook MR90Y V8VNT VR7HM W6XNM X29KD XRDW2 YGMTN [4-Cell 14.8V] Battery type: Li-ion; Voltage: 14.8V; Capacity: 40Wh; Cells: 4-cell; Color: Black Grade A Li-ion battery; Rigorous quality control; Ensure product safety and stability 100% NEW from Manufacturer; Replacement battery A genuine PUWDA&reg; product comes with 1 year warranty. Recognize the real product markings. Beware of imitation, fake and poor products. (PUWDA&reg; have no responsibility on the imitation product purchased) Fulfilled by Amazon