I've got an Acer Aspire 4520 about 3 months ago,today I decided to give its first full discharge,and when it had 10% of capacity left,instead of going to 9% it simple jump to 5%,where are my 4%? .Is that the way the battery shows how much capacity I've lost from aging and use of the cell?Because 4% loss of overall capacity for 3 months is pretty normal for li-ion cells.