Runpower Capacity Laptop Battery for Dell Inspiron MR90Y/14R/3421/5421/15R/3521/5521/17R/3721/5721/5737-12 Months Warranty [Li-ion 6Cell 11.1V 4400mAh] Battery Type: Li- ion; Capacity: 4400mAh; 6 Cell Voltage: 11.1V; 100% brand New from Manufacturer: Up to 500 recharge cycles over the life of the battery. Superior Quality Assurance: Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. CE-/FCC-/RoHS-Certified for safety:12 Months Warranty, 30 days money return guarantee; 24 x 7 email support.