This is actually a old problem, You must not have searched very well or not searching for the right terms.
Also I can't believe no one has the right answer yet.
I just recently got a AW 14500 for my D10 GD+. My problem sounded almost the same as what you discribed, The 14500 are a hair longer than a normal AA, The spring inside the piston has got to much around the bottom. Use something that will reach in a remove the spring i.e. tweezers. look at the base of the spring there is probaly a extra ring around the bottom, cut about 1/2 off the bottom/ big end and put it back in.
The battery being longer makes the spring compress all the way and the extra loop at the bottom is on top of each other, so the piston is not making the right contact.
After you do this you can still use a normal aa just like normal.