A couple of days ago when i started up my laptop (it was plugged in which was why it was working) i noticed my battery was not being detected. I figured it was just loose so i unplugged it and plugged it back in and let it charge. Now my laptop knows its there and says its fully charged at 100 but when i unplug it it goes completly dead. Im thinking something went wrong with the battery and ill need to replace it, but if theres anything else i could do to get it back up i would really appreciate it.