Dell Inspiron 1525 Laptop
Not Replacing battery which is under warranty

Respected Sir,

I have purchased the dell inspiron laptop 1525 in month of july 08. they have given me one year warranty. now the laptop battery is not working properly. it is at end of its life. i have told them to replace the battery, as my laptop is under warranty period. but they are saying that they won't replace the battery and we have to purchase a battery from them... how can i purchase a battery if my laptop is under warranty period...?