I'm going to make an assumption here. I am guessing that that customer wants to know where they are made, not just the brand name. These Duracell batteries most likely were made by Duracell. According to the packaging, they were made in Germany. They work very well and, so far, have last longer than other brands. Hope this answers your question!

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DuracellActivair Hearing Aid Batteries: Size 10 (80 Batteries)

Q: How long do these usually last? Like a single battery?

I've been using Duracell batteries for the last 9 months, since Feb. 8, 2017. I've always kept a record of my hearing aid battery usage since I started using hearing aids in July 2005. The battery in my right hearing aid lasts 4.5 to 5 days & the battery in my left hearing aid lasts 5 to 6 days. I can't see much of a difference in time from the batteries I've used before but the purchase price on this Duracell order was the best I could find lately.

Q: Are the duracell activair hearing aid batteries mercury free?

Since info says zinc air I assume they are mercury free. Better be.

Q: What is the difference between a #10, 4v. And a #10, 4.5v can they be used interchangeably? Will it damage my aids?

You mean 1.4 vs 1.45 volts? I guess standard #10 is 1.45V. 1.4V will not damage Aid, but may perform below peak.

Product ID: 288125547

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Details

Number of batteries
80 Product
Brand
Duracell
Battery cell composition
Zinc
Recommended uses for product
Hearing Aid
Voltage
1.45 Volts

⚡Zinc Air Tech

📦80 Batteries

🔋1.45V Power

Frequently Bought Together

Duracell Activair Hearing Aid Batteries: Size 10 (80 Batteries)

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Description

🔊 Hear the Difference with Duracell!

BULK VALUE PACK - Stock up with 80 batteries—never miss a moment of sound.
COMPACT DISCREET - Perfectly sized for your hearing aid, ensuring a seamless fit.
UNMATCHED LONGEVITY - Experience reliable, long-lasting power that keeps you connected.
SINGLE USE RELIABILITY - Each battery is designed for optimal performance, every time.
CONVENIENT EASY TAB DESIGN - Open with ease—no more fumbling with tricky packaging.

Duracell Activair Hearing Aid Batteries are designed for optimal performance and convenience. This pack includes 80 size 10 zinc air batteries, each providing reliable 1.45-volt power. With an easy-to-open EasyTab design, these batteries ensure you stay connected without the hassle.