I have an inspiron e1505/6400 t2400, just a few days ago, i realized tat my laptop would charge to 48% and then jump to 100%, but in reality it hasnt charged 100% and when i unplug the adapter, it immediately goes back to say that there is 48% of the battery left. Any ideas???? What is going on??? the battery name is delluy6286 and the unique id for the battery is 599sony delluy6286.