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

ProCell 12 Alkaline Batteries, 9V, 12/Box

Product ID: 1730148

Details

Battery Capacity
565
Battery Cell Composition
Alkaline
Brand
PROCELL
Number of Batteries
12 Product
Recommended Uses For Product
Radio

📦Bulk 12-pack for professional use

🔋9V high-capacity alkaline power

❄️Operates from -20°C to 54°C

C$3089

Duties & taxes included

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up your essentials with ProCell — because every professional deserves batteries that keep pace.

LONG LASTING POWER - Duracell Procell alkaline chemistry delivers consistent 9V energy that outlasts the competition.
EXTENDED SHELF LIFE - Keeps peak performance even after 7 years of storage—ready when you are.
TRUSTED AMERICAN QUALITY - Proudly made in the USA with a 2-year warranty for peace of mind.
BULK PROFESSIONAL PACKAGING - 12-pack bulk supply designed for seamless replacement cycles in industrial and home settings.
EXTREME TEMPERATURE RESILIENCE - Reliable performance from freezing cold to scorching heat, ensuring your devices never miss a beat.

Duracell Procell 9V alkaline batteries come in a convenient 12-pack, engineered for reliable performance across extreme temperatures (-20°C to 54°C). Designed for professional and industrial use, these batteries maintain power even after 7 years of storage. Made in the USA, they offer a 2-year warranty and deliver consistent, long-lasting energy for smoke alarms, tools, and critical devices.

Specifications

ASIN	B00009V2QZ
Antenna Location	Radio
Battery Capacity	565
Battery Cell Type	Alkaline
Battery Weight	2 ounces
Best Sellers Rank	#30,877 in Health & Household ( See Top 100 in Health & Household ) #24 in 9V Batteries
Brand	PROCELL
Customer Reviews	4.5 4.5 out of 5 stars (7,706)
Global Trade Identification Number	00041333002408, 00041333116402, 00041333526485, 00638458747033, 00792679619347, 00800011194459, 06213759971529, 07133363448929
Included Components	Duracell Procell 9V Batteries, Pack of 12 (Packaging May Vary)
Item Dimensions	4.5 x 2 x 2 inches
Item Weight	9.76 ounces
Manufacturer	Duracell
Model Name	Duracell Procell 9V Batteries, Pack of 12 (Packaging May Vary)
Model Number	PC1604
Number of Batteries	12 Product Specific batteries required.
Reusability	Single Use
UPC	792679619347 041333526485 800011194459 041333002408 638458747033 041333116402
Unit Count	12 Count
Voltage	9 volts
Warranty Description	No Warning Applicable

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