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

⚡9V high voltage power

📦12-pack bulk value

❄️🔥Operates -20°C to 54°C

₹ 5032

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Description

⚡ Stay powered, stay unstoppable — wherever life takes you!

MADE IN THE USA - Quality and reliability you can trust, proudly manufactured domestically
COMPACT LIGHTWEIGHT - Only 2 ounces per battery, perfect for portable devices
POWER THROUGH EXTREMES - Reliable performance from freezing cold to scorching heat (-20°C to 54°C)
BULK SUPPLY ZERO DOWNTIME - 12-pack ensures you never run out during critical moments
TRUSTED ALKALINE CHEMISTRY - Long-lasting 9V alkaline cells for consistent energy delivery

Duracell Procell 9V Alkaline Batteries come in a convenient 12-pack, delivering reliable 9-volt power with a robust alkaline chemistry. Engineered to perform flawlessly in extreme temperatures from -20°C to 54°C, these lightweight batteries are ideal for professional-grade electronics and critical devices. Proudly made in the USA, they combine durability and bulk value to keep your essential gear energized without interruption.

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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₹ 5032

Duties & taxes included

In stock

Sold byAmazon IndiaDelivered 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 India.

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