I breadboarded the LED flasher circuit from page 8 of Mims Circuit Scrapbook, V. 2, as shown below; I used a new 9v Duracell. It worked, and I walked away for about 10 minutes, and when I returned, the LED was no longer flashing, so I put in another LED. Same result, but not believing my eyes, I tried a third LED and watched. It started off flashing at what looked to be a normal brightness, but quickly got dimmer and dimmer. Now, it's almost imperceptible. Admittedly, these are bulk Chinese LED's, but still...
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