Like 9 cells 11.1V ,New Replacement Laptop Battery for Dell Latitude D620, Dell Latitude D630 Laptop Battery

This unit was charged in a D630C using Dell's A10 charger for 48 hours, It finally reached a 100% charge. It was powered up 5 days later only showing a 80% charge. This battery will now only charge to 95%. Swapped out the charger, same result. This shows the signs of a failing battery. I suspect it will fail within the year.