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I couldn't find this at the energizer or duracell website.
duracell.com
click to kill the snazzy-flash and get to the site
click "Professional Technical OEM Enter" (you want data, not consumer puffery)
left-menu, click the flavor of your choice, say "Alkaline Manganese"
blah-blah yadada... click "Technical Bulletin"
various datas...
"Perfomance... Capacity" has the amp/volt/hour discharge curves.
"Download PDF" has 13 pages, first few are puffery but pg 6-11 have real meat
Energeezer probably has similar pages, but why bother? A good-quality alkaline D-cell is a good-quality alkaline D-cell... all brands work nearly the same, plus/minus how long they have been in the the store, how hot, bad/good day in the factory, etc. RadioShack used to sell a book (RS# 62-1396) that listed their specs with discharge curves.
However different chemistries will give very different capacity, and maybe very load dependent. Ni-Cads run 1.25V for a long flat time, and then go right to zero. Carbon drops and drops and drops; if your application can tolerate low voltages then carbon almost never dies.
If you need bang/buck, always use the BIGGEST cell. AA, C and D don't differ 2:1 in price, but almost 8:1 in total amp-minutes.
