Dell Inspiron 1720 9-Cell Extended Life Replacement Battery
451-1047 Dell 11.1V 7200mAh Li-ion Battery for Dell Inspiron/1520/1521/1720 /1721/
Amazon.com: 11.10V,6600mAh,Li-ion,Hi-quality Replacement Laptop Battery for Dell Inspiron 1520, Inspiron 1521, Inspiron 1720, Inspiron 1721, Inspiron 530s, Vostro 1500, Vostro 1700, This laptop battery can replace the following part numbers of Dell:
Dell OEM Latitude E6400 E6500 M2400 M4400 Battery FX191