LB1 High Performance Extended Life Battery for Dell NR222 Dell Inspiron 1520 1721 1521 1720 530S Vostro 1700 1500 Laptop Notebook PC Computer fits 312-0504 312-0518 312-0520 312-0513 312-0576 312-0590 312-0575 312-0594 [9cells 11.1V 6600mAh] 18 Months Warranty LB1 High Performance Commercial Grade Laptop Batteries Fast charging, Low power consumption, Built-in protection circuit ensures both safety and stability The Product is manufactured in China