It's hard work untangling Duracell's pruct range and the relative
performance.

I don't think Duracell are great value but they can be got anywhere
and I want to know the relative merits of their popular alkaline
batteries.

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What is the rated capacity in mAh of an alkaline Duracell AA cell in
the following product ranges which I recall from (perhaps faulty?)
memory:

Duracell (ordinary)
Duracell Plus
Duracell M3

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The Duracell web site has a technical page but it refers only to:
(1) Ultra Digital
(2) Coppertop
http://www.duracell.com/oem/productdata/default.asp

Is Ultra Digital the same as Ultra or the same as M3?
Is Coppertop the same as Plus or the same as "ordinary"?

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yours confused
Alex