98% Plugged in, not charging.



I have 4 months old laptop.
Battery is 100% charged, After 2 days in ac power it shows 98%, plugged not charging. Then if I use the battery for a while less than 95% and if i plugged it in ac power, it starts charging and become 100%, fully charged. After two days it show 98%, plugged not charging.

So it is charging, but not holding the charge for some days. Battery replaced with a new one. Laptop is still under waranty.
I am getting 2 hour 20 minutes battery backup.
Would like to know is it a hardware or vista problem?
Thanx in adv.

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