Are these better stored at room temp or at 4degC?

I find better performance when stored at a steady room temp. Between 68 & 74 degrees Fahrenheit. Extreme cold or heat for long periods will lessen performance and longevity. Heat especially can cause leakage. (Don't leave them in your flashlight, in your car repeatedly for week after week in July and August).

Are these Duracell "procell" batteries really better than Duracell regular "copper top" alkaline batteries?

http://www.candlepowerforums.com/vb/showthread.php?100439-Duracell-coppertop-verses-Duracell-procell

where are these made? what country?

Made in the USA of foreign and domestic materials

how much longer is the life of this battery compared to a regular duracell? (flashlight life)

I can not say that they last longer, but are cheaper and last a long time. I have purchased several times and very happy.

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