Battery won't charge even if AC adapter is on-line

I recently installed Arch on my R61 Thinkpad. I did not have any problem I couldn't solve until today when I noticed that my battery won't charge anymore.
acpitool's output is:
Battery #1 : charged, 95.85%
AC adapter : on-line
Thermal zone 1 : ok, 48 C
Thermal zone 2 : ok, 45 C
Battery level will not go higher than this percentage, but will get lower if I unplug the adapter.
I don't know what is the source of this problem.

how old is the battery? how often was it recharged? batteries usually lose capacity over time. try to discharge and recharge it completely.

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    bump #2

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      Display Sleep Timer (Minutes):          10
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    Your battery has as much life in it as Ossama Binladen.  You need a new one which can be installed at an Apple store.  1241 cycles is more than one can reasonably expect.  Though you may operate your MBP with the power adapter, the performance will be slowed down by the OS until a new battery is installed.
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    -i've ordered a new Apple battery but no charging allowed,
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    Welcome to the Apple discussions.
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    phwruck wrote:
    Hi,
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    When I unplug the iPad, it's just counting down the battery as usual.
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    Because it says invalid. Apparently, they forgot to put a "it must start with 6N"
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    So I called Apple Support.
    I read the FAQ 5-8 times.

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