I have a lenovo laptop.it has a built in character that when charging is 100% full, it automatically shifts to direct supply of current.and a sign of battery changes to switch icon.as long as I was using win xp, it was OK.but since last 6 months I has installed win 7.and I can see no shifting to direct supply of current.can you guide me.I have tried a lot in power options but not working.

I may be wrong here, but I believe that the "power option" you are referring to is hardware controlled, and not so much software. The icon still shows the battery and the chord, I think that's just how Win7 display's the icon. In other words, it functions the same regardless of what the icon shows.

Win7 Icon does NOT change in the same way that XP's does.
It ALWAYS shows the battery AND plug when on power this changes to a battery when running on battery only.

THANKS

THANKS