tnforever
Newly Enlightened
My father uses some AA to D adaptors in a multi D cell radio that has a very low current draw. He's slowly working his way through a stockpile of semi-dead AA cells that run it fine.
Unfortunately I don't use anything that uses D cell batteries besides flashlights. I don't really even use anything that uses AA cells, besides flashlights (I have a good tank007 that will run on AAs that don't even light up a Fenix), other than that I only have a wireless keyboard that's rarely used (for my big screen TV's computer), and a wireless PS2 controller
I usually use semi-dead AA cells for running my everyday L2D, since they can utilize Alkalines quite well up to medium mode, and AAA cells go to my E01
Can't think of a use for semidead D cells though