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 Duracell Duracell Alkaline Batteries, 9V, 12/Box

Product ID: 315834023

Details

Battery capacity
9 Volts
Battery cell composition
Alkaline
Brand
PROCELL
Number of batteries
12 Product
Recommended uses for product
Radio

⚡Reliable alkaline energy

📦12-pack bulk value

🔋9V power punch

¥17550

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Description

⚡ Power your productivity with Duracell Procell 9V – because every volt counts!

CONSISTENT 9 V POWER - Engineered to deliver steady, high-performance energy for your critical devices.
BULK PACK EFFICIENCY - 12 batteries in one pack—perfect for professionals who demand uninterrupted workflow.
COMPACT LIGHTWEIGHT - At just 1.6 ounces each, these batteries fit seamlessly into your tech arsenal without bulk.
TOP RATED RELIABILITY - With a 4.7-star rating from over 1,500 users, join the community that trusts Duracell Procell.
TRUSTED ALKALINE CHEMISTRY - Duracell’s proven alkaline formula ensures long-lasting, dependable power.

Duracell Procell 9V Alkaline Batteries come in a convenient 12-pack, delivering consistent 9-volt power with proven alkaline chemistry. Lightweight and compact, these batteries are designed for professionals who need reliable, long-lasting energy for their essential devices. Highly rated and trusted globally, they ensure your tools never miss a beat.

Specifications

ASIN	B00009V2QZ
Antenna Location	Radio
Battery Capacity	9 Volts
Battery Cell Type	Alkaline
Battery Weight	1.6 Ounces
Best Sellers Rank	#28,793 in Electronics ( See Top 100 in Electronics ) #630 in Disposable Household Batteries
Brand	PROCELL
Customer Reviews	4.7 4.7 out of 5 stars (1,550)
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	11.4 x 5.1 x 5.1 centimeters
Item Type Name	Duracell Procell 9V Batteries, Pack of 12 (Packaging May Vary)
Item Weight	1.6 Ounces
Manufacturer	manufacturer: Energycell
Model Name	Duracell Procell 9V Batteries, Pack of 12 (Packaging May Vary)
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

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¥17550

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

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