Seriously don't understand why people buy Duracell.
Conventional good quality alkaline cells are between 1/4 and 1/8th the cost of Duracell yet have comparable impedance and capacity figures.
As an example, we tested "pound-shop" Alkaline cells versus Duracell; at 200mA there was negligible difference in capacity, at 1000mA the Duracells usually won slightly (though a few non-Duracell did beat them) but by rarely more than 5-10%. For the price difference, they are not worth it.
Of course, for devices that do support the lower terminal voltage, Ni-MH cells are very good indeed. I've been using them in a Fluke 287, my label printer, and a few other miscellaneous devices, and they work remarkably well.