>>>>>Hi everybody,
>>>>>
>>>>>I usually keep my laptop plugged in using regular power unit. Today I unplugged it for a short period of time and now it keeps telling me that my battery is running low and it needs re-charging. But why does it think that it needs to use battery?
>>>>>
>>>>>Is there something I need to adjust?
>>>>>
>>>>>I haven't re-started it for a long period of time, I usually just close it for the night and re-open the next day.
>>>>>
>>>>>Any ideas, advices?
>>>>
>>>>Assuming there's no specific problem with your particular battery or make/model of laptop, here's some general tips about use of modern laptop batteries: http://www.zdnet.com/blog/apple/the-correct-way-to-use-your-macbooks-battery/4310
>>>
>>>A generic question - right now I'm using power unit. Should the battery re-charge when I'm using it? Say, last night it went down to 7% (as I was not using power unit) and I don't see it's going up at all today (it still shows very low on the icon).
>>
>>It should recharge whether the computer is on or off.
>>
>>Does your battery indicator in the system tray show that it is plugged in?
>
>This is how it looks now - see attached picture.

It sure looks like it thinks it is plugged in. You could have a bad charger or battery.