You should be paying attention to the model number and if that's correct brand for it. There's a few out there that look the same but in real life there different and it wont exactly fit your dell.
Should do the trick: [ame="http://www.amazon.com/6600Mah-Replacement-Dell-Inspiron-Latitude/dp/B001SV571M"]http://www.amazon.com/6600Mah-Replacement-Dell-Inspiron-Latitude/dp/B001SV571M[/ame]