Hello Solomon! It seems that your battery may indeed be the one at fault as you have already tried using a new adapter thus ruling it out. In order to replace the battery you should refer to the Battery Replacement Guide so that you can properly access and remove your battery in order to replace it with a new one. You can find a new battery at places that sell laptop parts or online on websites such as eBay or the ASUS website as well. I hope that this helps and that your problem no longer persists after the battery change.