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I hate to disagree, but any battery will allow this "problem" and the SD-9 makes it far worse (Yes, I have several SD-8's, SD-8A's and SD-9's).
Its simply from shooting too quickly on high power settings. The thermal protection won't stop it either - by the time that shuts the flash down you can shoot many rapid fire full power shots.
I have seen the same thing in my SB-26's, SB-24's and SB-800's BTW. Its nothing new and certainly not limited to the SB-900. I also seriously doubt that it was "cured" with the Sb-910.
If you want them to stay pristine, keep them in a box on the shelf.
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