Has anyone had a problem with them being a bit larger than a standard alkaline 9-volt battery? I read some brands are tight in smoke detectors

They are slightly larger than normal 9v batteries. If you have the battery terminals that snap onto the battery, you might be ok. I have the type of smoke alarm that you slide the battery into and it’s supposed to “mate itself”. Because of the size difference and the battery being really squishy (not rigid) they did not work for me- I had to return all 8.

Are these batteries made in China or where?

While my personal belief is that it is safe to assume they are made in China, there is nothing on the batteries or on the packaging that indicates the country of origin.

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Enegitech 9V Lithium Battery

Product ID: 53934015

Details

Battery Capacity
1200 Milliamp
Battery Cell Composition
Lithium
Brand
Enegitech
Number of Batteries
4 Lithium Ion
Recommended Uses For Product
Camera Digital

⏳10-year shelf life

⚡1200mAh high capacity

🌡️Works -20℃ to 60℃

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€ 44.78

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power that outlasts your hustle — stay charged, stay ahead!

PERFECT FIT NO SURPRISES - Standard 9V size fits all compatible devices without the hassle of awkward replacements.
DECADE LONG BACKUP RELIABILITY - Up to 10 years of shelf life means your smoke detectors and fire alarms are always ready to protect.
ULTRA DENSE ENERGY FOR HIGH DRAIN DEVICES - Outperforms ordinary alkaline batteries by 3-5x in demanding gadgets like digital cameras and multi-meters.
DOUBLE THE POWER DOUBLE THE PEACE OF MIND - Lasts 2x longer than standard 600mAh lithium batteries, ensuring your devices stay powered when it matters most.
SMART PROTECTION AGAINST EXTREME CONDITIONS - Built-in safeguards keep performance steady from freezing cold to scorching heat (-20℃ to 60℃).

The Enegitech CR2 9V Lithium Battery delivers a robust 1200mAh capacity, lasting twice as long as typical 600mAh lithium batteries. Engineered for high-drain devices and critical safety equipment like smoke detectors, it offers up to a 10-year shelf life and reliable performance across extreme temperatures (-20℃ to 60℃). With smart built-in protection and a standard size fit, it’s the go-to power source for professionals who demand longevity and dependability.

Specifications

ASIN	B076MV1Z3P
Antenna Location	Camera,Digital,Smoke Detectors
Battery Capacity	1200 Milliamp Hours
Battery Cell Type	Lithium Manganese Dioxide
Battery Weight	140 Grams
Best Sellers Rank	#161,517 in Health & Household ( See Top 100 in Health & Household ) #111 in 9V Batteries
Brand	Enegitech
Built-In Media	Battery Pack
Customer Reviews	4.6 4.6 out of 5 stars (356)
Item Type Name	9v, lithium, battery, 1200mah, non-rechargeable, li-ion, battery.
Manufacturer	Enegitech
Model Name	9V
Model Number	9V 1200mAh
Number of Batteries	4 Lithium Ion batteries required. (included)
Reusability	Single Use
UPC	611677932503
Unit Count	4.0 Count
Voltage	9 Volts
Warranty Description	1 year manufacturer

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