X220 battery capacity getting lower with time (0.01 Wh per 2 days)

I've noticed my 9cell battery max capacity reported by Power Manager gets lower each day. I don't remember if it started with designed 93 Wh, but it's now at 90.98Wh and was 90.99Wh 2 days ago. Laptop is in use every day and it is recharged every day.
Is it more healthy to use battery or to connect it to AC when possible (battery inside)?

Hi toncijukic!
Yes, lithium-ion batteries lose capacity over time. To maximize the life of the battery, follow the advice in this knowledgebase article:
http://forums.lenovo.com/t5/Welcome-FAQs-Knowledge-Base/How-can-I-increase-battery-life/ta-p/244800
Hope this helps!
I don't work for Lenovo. I'm a crazy volunteer!

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JMVD,
Seems to me that you're quite the Apple expert. I had this problem with my eMac. Since, I am not American or English I hope I can make the problem chrystal clear.
I think I had the same problem with my screen. A few days ago I left my eMac running while not using it. After a while the screen became dark due to the "sleep modus setting" of course. This is not the first time this happens. Only this time after activating the eMac again my screen was so much darker. So of course I changed the screen setting (calibration) at the system preference menu. It improved the brightness of the screen but I noticed that it still was not normal. I said to myself: as long as I can work with it than it would be no problem. But then last night I forgot to shut down my eMac and again the screen got darker. This time I tried to change the setting again. Again the calibration process but I saw that I am using the maximum brightness and I got irritated by the quality of the color. And furthermore if the screen would get darker the next time I already used up the calibration / brightness possibities.
So I went looking for help at the apple site. And I found your discussion. And I just tried the command option o f advise of yours etc etc etc. After the automatic restart only the grey screen (background) with in the centre the apple logo appeared.
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I hope you can help me with this. Unfortunately, I do not have the apple care protection plan.
Thanx.

X220 battery capacity getting lower with time (0.01 Wh per 2 days)

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