Is this a good choice for smoke detectors?

It depends on whether your smoke detector is wired into the house wiring and the battery is just a backup, or if the battery is the only power source. If the battery is a backup to household power, a standard heavy duty (Non-alkaline) is best and also much cheaper, but needs to be replaced yearly. If the battery is the only power source, an alkaline battery like this is a good choice. Smoke detectors that are household wired and use the battery as a backup need a higher peak voltage to keep them from the occasional chirp sound that drives my dog crazy. A fresh/new heavy duty (non-alkaline) battery puts out over 10 volts and will easily last a year onder the light load of a smoke detector. A fresh/new alkaline battery will only put out about 9.4 - 9.5 volts, but it will handle a greater load for a longer time. My house wired smoke detectors start chirping at just under 9.4 volts, so my dog hates it if I use alkaline batteries in them.

Anybody know the mah rating of these?

The box nor battery have MaH. There are charts of their website for specs and usage, but no MaH. http://ww2.duracell.com/media/en-US/pdf/gtcl/Product_Data_Sheet/NA_DATASHEETS/PC1604_US_PC.pdf

what is the expiry date

The batteries I purchased in 1/2015 have a 3/2019 expiration date. It all depends on what seller you use.

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ProCell 12 Alkaline Batteries, 9V, 12/Box

Product ID: 1730148

Details

Battery Capacity
9
Battery Cell Composition
Alkaline
Brand
PROCELL
Number of Batteries
12 Product
Recommended Uses For Product
Industrial

⏳7+ years shelf life reliability

📦12-pack bulk value for pros

🔋9V high-capacity alkaline power

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Description

🔋 Power your essentials with ProCell — because every connection counts.

POWER THAT LASTS - 9V alkaline cells engineered for consistent, long-lasting energy in critical devices.
BULK BUY BULK SAVE - Economical 12-pack packaging designed for professional use and seamless device maintenance.
EASY EXPIRY TRACKING - Clear date markings on each battery help you stay ahead of replacements and avoid downtime.
SHELF STABLE PERFORMANCE - Retains peak power even after 7 years of storage—ready when you are.
TRUSTED BY PROFESSIONALS - Duracell Procell’s industrial-grade quality ensures dependable performance in smoke alarms, tools, and more.

Duracell Procell 9V Alkaline Batteries come in a convenient 12-pack bulk set, delivering reliable, long-lasting power with a shelf life exceeding 7 years. Designed for professional and home use, these batteries ensure your critical devices like smoke alarms and tools stay powered with industrial-grade quality and easy expiry tracking.

Specifications

ASIN	B00009V2QZ
Antenna Location	Industrial Professional
Battery Capacity	9
Battery Cell Composition	Alkaline
Battery Cell Type	Alkaline
Battery Weight	2 Ounces
Best Sellers Rank	#35,824 in Health & Household ( See Top 100 in Health & Household ) #29 in 9V Batteries
Brand	PROCELL
Built-In Media	Batteries
Customer Reviews	4.7 out of 5 stars 1,574 Reviews
Global Trade Identification Number	00041333526485
Item Dimensions	4.5 x 2 x 0.2 inches
Item Weight	9.76 ounces
Manufacturer	Duracell®
Model Name	Alkaline batteries
Model Number	DURPC1604
Number of Batteries	12 Product Specific batteries required.
Recommended Uses For Product	Industrial Professional
Reusability	Single Use
UPC	041333526485
Unit Count	12.0 Count
Voltage	9 Volts
Warranty Description	2 Year

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€ 51.18

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

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TrustScore 4.5 | 7,300+ reviews

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