Can anyone please compare the size of these batteries to the size of standard 9 volts? Are they the same size as standard batteries or longer?

Amazon 9V batteries received in November 2022 were not larger than a Duracell 9V in any dimension. Carefully measured. Many earlier answers say they are larger, but apparently that problem has been resolved.

Will these fit the standard fire/smoke alarms? comments say that amazon batteries are longer than others which are hard enough to install..thanks

In my review (http://www.amazon.com/review/RNAU5AWNID6IA/ref=cm_cr_rdp_perm) I provided detailed measurements and pictures of the batteries and side by side comparisons.The AmazonBasics and a Utilitech "heavy duty" battery, neither of which fit my CO detector, were both right about 0.6mm longer and 0.6mm fatter than a standard Duracell battery which did fit my CO detector. It seems these are the "big" 9v's (Possibly "Heavy duty"?). They do fit in my smoke detectors, but it really comes down to whether you have a cramped battery compartment or one that does weird things to connect the battery. You should probably pass if that's the case or if you've had issues installing your current batteries.

How much ampere for a battery ?

rightbattery has measured them at 481 mAh for a 50 mA (light) load, which is second only to Ikea's - they have test results for a dozen different 9-volts there.

I need these for a rental property. The city requires that they have expiration dates listed on the battery themselves. Can anyone confirm?

The date is very small on the bottom of the battery. Just received a box of 8, expiration 02/2025.

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Amazon Basics 8-Pack 9V Long-Lasting Alkaline Batteries for Smoke Detector, Electronics & Audio, Reliable, 5-Year Shelf Life

Amazon Basics 8-Pack 9V Long-Lasting Alkaline Batteries for Smoke Detector, Electronics & Audio, Reliable, 5-Year Shelf Life

Product ID: 13548482

Details

Battery Capacity
550 Hour (mAh)
Battery Cell Composition
Alkaline
Brand
Amazon Basics
Number of Batteries
8 9V batteries
Recommended Uses For Product
Radio Toys

⏳5-year leak-free shelf life

📦8-pack value bundle

🔋9V power punch

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€ 27.74

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In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Battery Capacity
550 Hour (mAh)
Battery Cell Composition
Alkaline
Brand
Amazon Basics

Description

🔋 Stay powered, stay protected — because your peace of mind can’t wait.

SMART STOCK UP - 8-pack bundle offers unbeatable value—never run out of power for your critical electronics.
EMERGENCY READY - 5-year shelf life means these batteries are always ready when you need them most.
POWER THAT LASTS - Reliable 9V alkaline cells deliver steady 550mAh capacity for your essential devices.
HASSLE FREE PACKAGING - Certified Frustration-Free Packaging ensures easy access and storage without the struggle.
VERSATILE COMPATIBILITY - Perfect fit for smoke detectors, garage door openers, radios, toys, and more.

Amazon Basics 8-Pack 9V Alkaline Batteries provide dependable, long-lasting power with a 5-year leak-free shelf life. Ideal for household essentials like smoke detectors and radios, this value pack features easy-to-open packaging and a reliable 550mAh capacity, ensuring your devices stay powered when it matters most.

Specifications

ASIN	B00MH4QM1S
Amperage	8 Amps
Antenna Location	Radio,Toys,Smoke Detectors
Battery Capacity	550 Milliampere Hour (mAh)
Battery Cell Composition	Alkaline
Battery Cell Type	Alkaline
Best Sellers Rank	#117 in Health & Household ( See Top 100 in Health & Household ) #1 in 9V Batteries #22 in Sales & Deals
Brand	Amazon Basics
Compatible Phone Models	radio
Customer Reviews	4.7 out of 5 stars 242,195 Reviews
Global Trade Identification Number	00841710157253
Item Dimensions	1.04 x 0.69 x 1.91 inches
Item Type Name	Alkaline Battery
Item Weight	0.05 Kilograms
Manufacturer	Amazon “This product may originate from Malaysia or China"
Model Name	9V BATTERY
Model Number	6LR61-8PK
Number of Batteries	8 9V batteries required. (included)
Recommended Uses For Product	Radio,Toys,Smoke Detectors
Reusability	Single Use
UPC	841710157253
Unit Count	8.0 Count
Voltage	9 Volts

Reviews

M**W

27.02.2026

E**N

17.03.2026

A**R

12.04.2026

S**E

15.04.2026

C**.

13.04.2026

J**P

2.02.2026

W**Y

15.03.2026

M**N

16.04.2026

T**N

4.09.2025

M**A

14.01.2026

E**I

6.10.2025

R**S

6.10.2025

＼**／

15.03.2026

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