Sony :: Vaio VGN-NS110E BatteryHow To Use

First of all - Is it okay to keep the Laptop plugged in even when it is fully charged and in use. The Battery even when completely charged shows charging while in other Brands it shows that it is on AC power, so I am a bit confused. Because if it is still being charged then the over-charging might harm the Battery and reduce it's life considerably.

Second - If it's Ok to keep it plugged in when using, at what interval we should let the battery discharge completely because I think it is important to let it discharge completely once in a while.

Third - After charging the Laptop completely and Shutting it down (while continuing charging and unplugging it only after it's Shut down) when I check it after 8-10 hours of no-use the battery is around 15 percent down, i.e it loses 15 percent of charging even when it is Shut down. But if I keeps it in Hibernation it loses only around 10-12 percent of battery at most. Which i find quite amazing as it should lose more battery in Hibernation mode as compared to Shut down, isn't it?

These are my questions and I am sure many other users like me will also be getting these questions on their minds and looking for an answer, so it will be of great help for them also.