There is nothing wrong with your Duracells. Alkaline batteries just aren't up to the task of providing the current that digital camera draw. Using them in digital cameras just kills them.

NiMH and the various other formulae are much better ar providing the current that they need.

"Alkaline batteries are simply unsuitable for high current-drain devices like digital cameras: in many cases the digital camera shuts down after only a few minutes. So called "Ultra" Alkaline batteries fare little better - their battery chemistry, capacity to supply large currents, internal resistance and rapid drop of voltage makes them unsuitable for digital cameras and other high current drain devices.

Unlike Alkaline batteries, NiMH rechargeable batteries can maintain a steady voltage throughout their discharge cycle - enabling hundreds, rather than merely a handful, of photos to be taken. And then of course you can recharge them - up to a thousand times. Even if you take a couple of hundred shots a week, they could last for over 10 years!"

http://www.digibattery.co.uk/