Key Power Laptop Battery [4 cell - 14.8V/40Wh] for Dell Inspiron 14, 14R, 15, 17, 17R, also fit XCMRD, 0MF69 - [18 Months Warranty] Compatible: Dell Inspiron 14 (3421 3437), Inspiron 14R (5421 5437), Inspiron 15 (3521 3537), Inspiron 17 (3721 3737), Inspiron 17R (5721 5737); Dell Vostro (2421 2521) Series Battery type: Li-ion; Capacity: 40Wh; Cells: 4-cell; Voltage: 14.8V. Safety: CE-/FCC-/RoHS-Certified. Up to 600 recharge cycles over the life of the battery. Performance: Grade A cells ensure fast charging and low power consumption with built-in circuit protection ensure safety and longevity. Quality: Exact 1:1 ratio battery life capacity as your Dell original OEM battery.