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

⏳7-year shelf life reliability

📦12 batteries bulk value

🔋9V power-packed performance

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R$444

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Stay powered, stay ahead — never get caught powerless!

POWER THAT LASTS - 9V alkaline cells engineered for consistent, long-lasting energy in professional and home devices.
SMOKE ALARM READY - Perfect for safety devices with enough batteries to cover all your alarms and more.
BULK BUY BULK SAVE - 12-pack packaging designed for cost-effective replacements and uninterrupted device uptime.
SHELF STABLE RELIABILITY - Maintains peak performance even after 7 years in storage—ready when you are.
TRUSTED INDUSTRIAL GRADE - Duracell Procell’s industrial-grade quality ensures dependable power for critical applications.

Duracell Procell 12-pack 9V alkaline batteries deliver professional-grade, long-lasting power with a 7-year shelf life. Ideal for industrial and home use, this bulk pack offers reliable energy for smoke alarms, tools, and other essential devices, backed by a trusted brand and a 2-year warranty.

Specifications

ASIN	B00009V2QZ
Antenna Location	Industrial Professional
Battery Capacity	9
Battery Cell Type	Alkaline
Battery Weight	2 Ounces
Best Sellers Rank	#34,800 in Health & Household ( See Top 100 in Health & Household ) #31 in 9V Batteries
Brand	PROCELL
Built-In Media	Batteries
Customer Reviews	4.7 4.7 out of 5 stars (1,578)
Global Trade Identification Number	00041333526485
Item Dimensions	4.5 x 2 x 0.2 inches
Item Weight	0.61 Pounds
Manufacturer	Duracell®
Model Name	Alkaline batteries
Model Number	DURPC1604
Number of Batteries	12 Product Specific batteries required.
Reusability	Single Use
UPC	041333526485
Unit Count	12.0 Count
Voltage	9 Volts
Warranty Description	2 Year

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