Hi Graham,Depending on how much internal memory you want, you could get the DS40 or the DS50. The battery life, I would say, is about twenty hours playing audio books but might well be a lot more than that playing voice files. You can use NIMH rechargeable batteries in the recorder but you need a separate charger as they cannot be charged in the player itself. If you get high capacity batteries, I don't see why you couldn't get the same long battery life as from standard triple A's.
Cheers,Sandra.
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