Most likely because you have left your laptop on charge constantly without it needing charge causing the battery within the laptop to become instable. (basically replace the battery)
What do you mean pretend laptop?
yes my laptop is charging
did you mean to ask what to do if your laptop battery is not charging? if that is the case http://laptop-battery-not-charging.com/ might be able to help you.
Yes as over-charging the laptop reduces it's battery life.
No, because there is nothing to charge.
The way to stop your laptop from charging is to unplug the charger from the computer. When the battery starts to get low on power plug it back in.
It Means Charging
After charging laptop it will 3 to 4 hours backup
No.
as long as you have your laptop plugged in, you can use it.
To charge your Toshiba laptop, you'll need the appropriate power adapter that matches your laptop model. Plug the adapter into a power outlet and connect the other end to your laptop's charging port. Ensure the connection is secure and check for any indicator lights to confirm that the laptop is charging. If your laptop has a removable battery, make sure it is properly installed.
You cannot tell. You would need to turn it on.