Battery won't charge past 80% U460

Today I noticed my battery won't charge past 80% on my U460 laptop. I bought it around 9/30/2010 and currently using Windows 7 home edition. Tried completely discharging it and regarging and still no luck. I find it hard to believe it could be already dying on me with how I take care of it . Any help?

http://imageshack.us/a/img534/4571/82548781.png

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    bump #2

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      PCB Lot Code:          0
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      Hardware Revision:          000a
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      Display Sleep Timer (Minutes):          0
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