The holes don't have to line up, but there are variations in all the KR808D-1 products from different manufacturers. All you have to do is screw it in until it is snug. If you are not getting good vapor, it could be several things:
* Weak battery - some batteries, especially the short ones, loose their ability to hold a charge.
* Dirty battery - try using an old tooth brush to clean out the contacts and air holes. No alcohol needed.
Let us know what you find out.