My laptop shuts down automatically within 2 to 5 minutes on battery. It works only when I'm charging

[Musharraf1]

My laptop shuts down automatically within 2 to 5 minutes on battery. It works only when I'm charging. When i remove the charging plug it stays on for 5 mins only and shuts down automatically. While when i use the laptop without plugged in at the beginning itself it shuts down without 2mins. Also it stays awake on the lockscreen, later when i log in and open any application or play any video it shuts down automatically. And when i try starting it again it doesn't on, only it shows the lock screen and shuts off automatically again.

Im facing this issue from past 1 month.

I tried resolving it by cleaning the fan, updating BIOS, changing power settings etc. But still its all the same. Please help me out as soon as possible. 

And i use my laptop everyday for 5hrs exactly!

Please state me the reason for it and also the solution to overcome this issue..

Hope u answer my question as soon as possible!

Thank you!

[Musharraf1]

Also it stays awake when i log in the laptop. But when i open any app or anything (also if i jusy click the windows key) it shuts down automatically! Plz reply me !