my dad has pretty old laptop (2010 and hasn' been used since 2012 or something) and since it upgraded to windows 10 the battery icon shows that it's not charging and it also shows 100%. but when i remove the battery while it's still on it recognizes that it's gone. when i put it back it still thinks it's gone even tho you hear the sound of the battery connecting. its not the upper part of the ac adapter, i tested it.