Battery not charging and PSU acting strangely

[Yenix]

Hello,
I have the following problem:
Today, when I plugged my PSU to my TP600, it did not start charging the battery. (in Windows, there remains the battery symbol in the tray).
When I turn off the laptop and connect the PSU, the battery light flashes orange few times, then it stays green for about 5 seconds and then it starts to flash orange again. After some flashes, the light turns green for a short time again and so on. The number of flashes varies from 3 to 9 flashes.
The battery is about 1 year old and I can run the NB on it for about two hours.
The PSU is original IBM 16V 3.36A.
Have any idea what can be wrong?
And one more stupid question. Should I try to connect the laptop to the PSU and try to turn it on when the battery is taken out?
Thanks for your experiences.
J.

[nitro2k01]

Try getting mobilmeter, check for the wear level in the preferences.