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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Duracell D12 Procell Professional Alkaline Battery, 12Count

Product ID: 2938037

Details

Number of Batteries
12 C batteries
Brand
DURACELL
Battery Cell Composition
Alkaline
Battery Capacity
12 Volts
Recommended Uses For Product
Radio

⚡Long-lasting alkaline power

🏭Industrial-grade reliability

🔋12-count bulk pack

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31548CFA

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In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Number of Batteries
12 C batteries
Brand
DURACELL
Battery Cell Composition
Alkaline

Description

🔋 Power up like a pro — never get caught powerless again!

UNMATCHED LONGEVITY - Power through your busiest days with batteries that outlast the competition.
BULK PACK EFFICIENCY - 12 high-performance cells to keep your devices running without interruption.
COMPACT CONVENIENT - Sized perfectly for easy storage and quick access when you need power fast.
PROFESSIONAL GRADE POWER - Engineered for industrial use, ensuring consistent and reliable energy delivery.
TRUSTED DURACELL QUALITY - Backed by Duracell’s legacy of dependable alkaline technology.

The D12 Procell Professional Alkaline Battery pack includes 12 industrial-grade alkaline cells designed for long-lasting, reliable power. Ideal for professional and industrial applications, these batteries deliver consistent energy performance in a compact, easy-to-store package.

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