Hello Gsreeshman and welcome to the forum,
Is your laptop still under warranty? If it is so, my advice is to bring it to a technician authorized by the laptop's manufacturer to make the tests. Otherwize, if the lappy is out of warranty, you could open it, while the battery and the charger are unplugged and replace the CMOS battery. It looks like a battery of a watch. So, once you have localized it, change it with another or leave it for some mins to discharge if you don't have any new.
Hope I gave you an idea.