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
692
Battery Cell Composition
Alkaline
Brand
PROCELL
Number of Batteries
12 Product
Recommended Uses For Product
Baby Monitor

⚡692mAh capacity

🌡️Operates -4 to 130°F

🗓️5-year shelf life

$U2873

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 ProCell 9V: Powering Professionals, Securing Peace of Mind

POWER YOU CAN TRUST - Engineered for safety-critical devices where failure is not an option.
BULK PACK EFFICIENCY - 12-pack ensures you’re always stocked for scheduled maintenance and emergencies.
LONG LASTING FRESHNESS - Up to 5 years shelf life reduces dead batteries and costly service calls.
ONE BATTERY ENDLESS USES - Standardized 9V cell powers alarms, medical devices, audio gear, and more.
BUILT FOR EXTREME CONDITIONS - Reliable performance from freezing cold to scorching heat.

ProCell 12-pack 9V alkaline batteries deliver professional-grade, reliable power designed for safety-critical and high-use devices. With a robust 692mAh capacity, consistent performance across -4 to 130°F, and a 5-year shelf life, these batteries minimize downtime and maintenance for facilities, schools, and commercial operators. Trusted for smoke detectors, alarms, medical equipment, and professional audio, ProCell ensures your critical devices stay powered when it matters most.

Specifications

ASIN	B00009V2QZ
Antenna Location	Baby Monitor, Clock, Gaming Controller, Radio, TV Remote
Battery Capacity	692 milliamp_hours
Battery Cell Type	Alkaline
Battery Weight	1.6 ounces
Best Sellers Rank	#35,073 in Health & Household ( See Top 100 in Health & Household ) #29 in 9V Batteries
Brand	PROCELL
Customer Reviews	4.7 4.7 out of 5 stars (1,603)
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	1.6 ounces
Manufacturer	PROCELL
Model Name	Procell 9V
Model Number	PC 1604
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	Manufacturer warranty included

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