"Consider replacing your battery/your battery may be broken" --> please help

Hi friends,
I am having a lenovo thinkpad sl400c laptop and have installed windows 7 and ubuntu in dual boot.

My problem is obvious from the title..Let me elaborate it..

>When ever i login to windows, it shows the warning as consider replacing your battery and the battery lasts only 25 minutes on a full charge. (Then automatically hibernates)

> When ever i login to ubuntu, it shows your battery may be broken and shows the full charge percentage as 14.1%

Here is the problem, when it runs equally(more or less) on both OS, i would consider replacing my battery, but it hibernates only in windows.. In contrast, while in linux, inspite of critical battery alarm, i can use my laptop for atleast 1hour with zero battery status.

please help me out..

Solutions tried:
1. Installed latest power manager drivers in windows
2. Upgraded BIOS (only after this problem and on suggestion by lenovo care)

Now from my above experience, i am damn sure that the battery is in good condition, BTW, the notebook is 16 months old

Why don't you check the battery with Lenevo??

Trying a solution before taking that step dude :))

Well, I'd suggest to contact your vendor directly rather than RnD on laptops.

Well Ubuntu actually don't take up much juice from he battery so it would run for longer than windows but I can't comment about the difference. Also you should contact vendor as suggested by krishnandu.