I've use just one Diode 1N5817. It was frans, a kind of guru on this matter that indicate this one to this type of battery, after some testing. he can sell you directly and very cheap this diode and also the one that are best for using the normal LR44 1.5v batterys in many cameras from the 70's to replace the original 1.3v battery. contact him, PX625 Battery Adapter <firstname.lastname@example.org>, you can search in google , because he have a file in pdf very good to modify the cameras or make an adapter.
i just see now that this guy is the same that
in the file it doesn't mention the diode 1N5817, but it is the best, and he recommended it for this battery.
if you need help, i can send the photo of how to install, but with the pdf i think you won't need it