Robert Baer wrote:

Too bad nobody has a corresponding high capacity D-cell (ie: capacity
would be about 4 times).
Seems all of the "best" D-cells have the same capacity as the AA and
the weight is about the same.

I was wrong.
Maha indeed has high capacity D-cells; in fact two types:
Their Powerex 11,000 (high capacity):
http://www.mahaenergy.com/store/view...?idProduct=342
And their low self discharge Imedion 9,500:
http://www.mahaenergy.com/store/view...?idProduct=432
Even their low self discharge is impressive in capacity; exceeds
anything else i have ever seen; the Energizer (which is supposed to be
hot sh*t) D cell is 2500mAh, essentially *identical* to AA cells.