T61 - sudden battery death

Hi, I have a Thinkpad T61 for little over 2 years now and a problem with my battery. I'm using the original battery pack and kept it charged between 70 and 90 % for the periods I mainly used the AC-connector, so in theory, the pack should work. Yesterday, I plugged out the power-supply, because I wanted to take the laptop into another room and there the battery died after just 10 minutes, before that I had typical battery life of about 2 hours!! So I recharged the batterypack over night and tried again, nothing changed. Strange thing is, when I look at the battery capacity over time, it starts at nearly 100% and decreases slowly (predicted battery life about 2 hours), after approximately 10 minutes it just jumps from 90 to 4 or 5 %. That doesn't make any sense to me! Why is the decrease so abrupt? When I mesaure the battery-voltage, I still get like 12 V, although it shouldn't be that much, right?
My guess is, that there is something wrong with the chip on the battery, but I don't know how I can fix that...
As I learned, Lenovo only offers 12 months guaranty on battery-packs, is that true?
Is there anything I can do to reach the 2 hours battery life again (other than buying a new pack)?
Thanks for your answers!

Hi julphy,
Yes, it's true, warranty on the battery is only 1 year.
Battery is a consumable item that requires replacement at end of its life, usage of over 2 years is an ample life time for the battery in my stance. There is no fix other than buying new battery, sorry!
Hope this helps.
Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
Apple:- Macbook Air [Snow Leopard]
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T61 - sudden battery death

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