Battery type: Li-ion; Cells:6 Cells; Capacity: 5200MAH ; Voltage: 11.1V Compatible Models: W280 0UW280 NR239 312-0589 451-10477 FK890 GK479 312-0504 312-0575 312-0576 312-0590 312-0594 FP282 Compatible Part Numbers: Dell Inspiron 1520 Dell 1521 Dell 1721 Dell Vostro 1500 Dell Vostro 1700 Security and Stable Quality: All of our products are certified by CE, FCC for safety. Strict guidelines for compatibility, and standards compliance for environment safety. Use of built-in circuit protection to ensure safety and stability.